21012301524 has 12 divisors (see below), whose sum is σ = 49028703584. Its totient is φ = 7004100504.

The previous prime is 21012301469. The next prime is 21012301573. The reversal of 21012301524 is 42510321012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21012301524.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875512552 + ... + 875512575.

Almost surely, 2^21012301524 is an apocalyptic number.

It is an amenable number.

21012301524 is an abundant number, since it is smaller than the sum of its proper divisors (28016402060).

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

21012301524 is a wasteful number, since it uses less digits than its factorization.

21012301524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751025134 (or 1751025132 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21012301524 its reverse (42510321012), we get a palindrome (63522622536).

The spelling of 21012301524 in words is "twenty-one billion, twelve million, three hundred one thousand, five hundred twenty-four".