21356120124045 has 576 divisors, whose sum is σ = 46775164939776. Its totient is φ = 8963461140480.

The previous prime is 21356120124043. The next prime is 21356120124049. The reversal of 21356120124045 is 54042102165312.

21356120124045 is a `hidden beast` number, since 2 + 1 + 3 + 561 + 2 + 0 + 12 + 40 + 45 = 666.

It is not a de Polignac number, because 21356120124045 - 2¹ = 21356120124043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356120124043) by changing a digit.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 77097906447 + ... + 77097906723.

It is an arithmetic number, because the mean of its divisors is an integer number (81206883576).

Almost surely, 2^{21356120124045} is an apocalyptic number.

It is an amenable number.

21356120124045 is an abundant number, since it is smaller than the sum of its proper divisors (25419044815731).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21356120124045 is a wasteful number, since it uses less digits than its factorization.

21356120124045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21356120124045 its reverse (54042102165312), we get a palindrome (75398222289357).

The spelling of 21356120124045 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred twenty million, one hundred twenty-four thousand, forty-five".