21042232524 has 36 divisors (see below), whose sum is σ = 53983975864. Its totient is φ = 6909388992.

The previous prime is 21042232493. The next prime is 21042232529. The reversal of 21042232524 is 42523224012.

21042232524 is a `hidden beast` number, since 2 + 104 + 2 + 2 + 32 + 524 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21042232529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4359577 + ... + 4364400.

Almost surely, 2^21042232524 is an apocalyptic number.

It is an amenable number.

21042232524 is an abundant number, since it is smaller than the sum of its proper divisors (32941743340).

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

21042232524 is a wasteful number, since it uses less digits than its factorization.

21042232524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8724054 (or 8724049 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21042232524 its reverse (42523224012), we get a palindrome (63565456536).

The spelling of 21042232524 in words is "twenty-one billion, forty-two million, two hundred thirty-two thousand, five hundred twenty-four".