21425235512445 has 24 divisors (see below), whose sum is σ = 37141792519416. Its totient is φ = 11425340694528.

The previous prime is 21425235512419. The next prime is 21425235512449. The reversal of 21425235512445 is 54421553252412.

21425235512445 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 52 + 3 + 551 + 2 + 4 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 501170548356 + 20924064964089 = 707934^2 + 4574283^2 .

It is not a de Polignac number, because 21425235512445 - 2⁸ = 21425235512189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21425235512445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425235512449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29883004 + ... + 30591573.

It is an arithmetic number, because the mean of its divisors is an integer number (1547574688309).

Almost surely, 2^{21425235512445} is an apocalyptic number.

It is an amenable number.

21425235512445 is a deficient number, since it is larger than the sum of its proper divisors (15716557006971).

21425235512445 is a wasteful number, since it uses less digits than its factorization.

21425235512445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60482461 (or 60482458 counting only the distinct ones).

The product of its digits is 1920000, while the sum is 45.

Adding to 21425235512445 its reverse (54421553252412), we get a palindrome (75846788764857).

The spelling of 21425235512445 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred thirty-five million, five hundred twelve thousand, four hundred forty-five".