21353521162524 has 48 divisors (see below), whose sum is σ = 52972147694592. Its totient is φ = 6679909268032.

The previous prime is 21353521162507. The next prime is 21353521162529. The reversal of 21353521162524 is 42526112535312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353521162529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729870564 + ... + 729899819.

It is an arithmetic number, because the mean of its divisors is an integer number (1103586410304).

Almost surely, 2^{21353521162524} is an apocalyptic number.

It is an amenable number.

21353521162524 is an abundant number, since it is smaller than the sum of its proper divisors (31618626532068).

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

21353521162524 is a wasteful number, since it uses less digits than its factorization.

21353521162524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459770466 (or 1459770464 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

Adding to 21353521162524 its reverse (42526112535312), we get a palindrome (63879633697836).

The spelling of 21353521162524 in words is "twenty-one trillion, three hundred fifty-three billion, five hundred twenty-one million, one hundred sixty-two thousand, five hundred twenty-four".