21105331234524 has 48 divisors (see below), whose sum is σ = 54717860954400. Its totient is φ = 7035067271808.

The previous prime is 21105331234457. The next prime is 21105331234541. The reversal of 21105331234524 is 42543213350112.

21105331234524 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 5 + 3 + 3 + 123 + 4 + 524 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20527632 + ... + 21531240.

It is an arithmetic number, because the mean of its divisors is an integer number (1139955436550).

Almost surely, 2^{21105331234524} is an apocalyptic number.

It is an amenable number.

21105331234524 is an abundant number, since it is smaller than the sum of its proper divisors (33612529719876).

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

21105331234524 is a wasteful number, since it uses less digits than its factorization.

21105331234524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198339 (or 1198331 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21105331234524 its reverse (42543213350112), we get a palindrome (63648544584636).

The spelling of 21105331234524 in words is "twenty-one trillion, one hundred five billion, three hundred thirty-one million, two hundred thirty-four thousand, five hundred twenty-four".