145243514421 has 32 divisors (see below), whose sum is σ = 225413184000. Its totient is φ = 92306620224.

The previous prime is 145243514419. The next prime is 145243514501. The reversal of 145243514421 is 124415342541.

145243514421 is a `hidden beast` number, since 1 + 452 + 43 + 5 + 144 + 21 = 666.

It is not a de Polignac number, because 145243514421 - 2¹ = 145243514419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145243514411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1112170 + ... + 1235883.

It is an arithmetic number, because the mean of its divisors is an integer number (7044162000).

Almost surely, 2^145243514421 is an apocalyptic number.

It is an amenable number.

145243514421 is a deficient number, since it is larger than the sum of its proper divisors (80169669579).

145243514421 is a wasteful number, since it uses less digits than its factorization.

145243514421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348170 (or 2348164 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

Adding to 145243514421 its reverse (124415342541), we get a palindrome (269658856962).

The spelling of 145243514421 in words is "one hundred forty-five billion, two hundred forty-three million, five hundred fourteen thousand, four hundred twenty-one".