21402057088 has 32 divisors (see below), whose sum is σ = 42790905360. Its totient is φ = 10662379008.

The previous prime is 21402057073. The next prime is 21402057091. The reversal of 21402057088 is 88075020412.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21402057088² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266356 + ... + 337267.

Almost surely, 2^21402057088 is an apocalyptic number.

It is an amenable number.

21402057088 is a deficient number, since it is larger than the sum of its proper divisors (21388848272).

21402057088 is an equidigital number, since it uses as much as digits as its factorization.

21402057088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603914 (or 603902 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The spelling of 21402057088 in words is "twenty-one billion, four hundred two million, fifty-seven thousand, eighty-eight".