21062164400 has 60 divisors (see below), whose sum is σ = 51295097112. Its totient is φ = 8309445120.

The previous prime is 21062164397. The next prime is 21062164439. The reversal of 21062164400 is 446126012.

It is a super-2 number, since 2×21062164400² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21062164400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331454 + ... + 389853.

Almost surely, 2^21062164400 is an apocalyptic number.

21062164400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21062164400 is an abundant number, since it is smaller than the sum of its proper divisors (30232932712).

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

21062164400 is a wasteful number, since it uses less digits than its factorization.

21062164400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721398 (or 721387 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21062164400 in words is "twenty-one billion, sixty-two million, one hundred sixty-four thousand, four hundred".