21231524067696 has 80 divisors (see below), whose sum is σ = 60957498604320. Its totient is φ = 7075414056960.

The previous prime is 21231524067673. The next prime is 21231524067737. The reversal of 21231524067696 is 69676042513212.

It is a happy number.

21231524067696 is a `hidden beast` number, since 2 + 1 + 2 + 31 + 52 + 406 + 76 + 96 = 666.

It is a super-2 number, since 2×21231524067696² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 4374225 + ... + 7848368.

It is an arithmetic number, because the mean of its divisors is an integer number (761968732554).

Almost surely, 2^{21231524067696} is an apocalyptic number.

It is an amenable number.

21231524067696 is an abundant number, since it is smaller than the sum of its proper divisors (39725974536624).

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

21231524067696 is a wasteful number, since it uses less digits than its factorization.

21231524067696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12226631 (or 12226619 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 21231524067696 in words is "twenty-one trillion, two hundred thirty-one billion, five hundred twenty-four million, sixty-seven thousand, six hundred ninety-six".