21263164760 has 32 divisors (see below), whose sum is σ = 47878842960. Its totient is φ = 8498737536.

The previous prime is 21263164753. The next prime is 21263164763. The reversal of 21263164760 is 6746136212.

It is a happy number.

It is a super-2 number, since 2×21263164760² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263164763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151079 + ... + 255638.

Almost surely, 2^21263164760 is an apocalyptic number.

21263164760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21263164760 is an abundant number, since it is smaller than the sum of its proper divisors (26615678200).

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

21263164760 is a wasteful number, since it uses less digits than its factorization.

21263164760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408035 (or 408031 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21263164760 in words is "twenty-one billion, two hundred sixty-three million, one hundred sixty-four thousand, seven hundred sixty".