421555125011445 has 12 divisors (see below), whose sum is σ = 730695550019916. Its totient is φ = 224829400006080.

The previous prime is 421555125011411. The next prime is 421555125011497. The reversal of 421555125011445 is 544110521555124.

421555125011445 is a `hidden beast` number, since 4 + 2 + 1 + 5 + 551 + 2 + 50 + 1 + 1 + 4 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63330496138116 + 358224628873329 = 7958046^2 + 18926823^2 .

It is not a de Polignac number, because 421555125011445 - 2¹² = 421555125007349 is a prime.

It is a super-2 number, since 2×421555125011445² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 9367891666921 = 421555125011445 / (4 + 2 + 1 + 5 + 5 + 5 + 1 + 2 + 5 + 0 + 1 + 1 + 4 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 421555125011445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4683945833416 + ... + 4683945833505.

It is an arithmetic number, because the mean of its divisors is an integer number (60891295834993).

Almost surely, 2^{421555125011445} is an apocalyptic number.

421555125011445 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421555125011445 is a deficient number, since it is larger than the sum of its proper divisors (309140425008471).

421555125011445 is a wasteful number, since it uses less digits than its factorization.

421555125011445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9367891666932 (or 9367891666929 counting only the distinct ones).

The product of its (nonzero) digits is 800000, while the sum is 45.

Adding to 421555125011445 its reverse (544110521555124), we get a palindrome (965665646566569).

The spelling of 421555125011445 in words is "four hundred twenty-one trillion, five hundred fifty-five billion, one hundred twenty-five million, eleven thousand, four hundred forty-five".