21636967468 has 24 divisors (see below), whose sum is σ = 39674970720. Its totient is φ = 10305166080.

The previous prime is 21636967441. The next prime is 21636967507. The reversal of 21636967468 is 86476963612.

It is a happy number.

It is a super-2 number, since 2×21636967468² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465763 + ... + 510106.

It is an arithmetic number, because the mean of its divisors is an integer number (1653123780).

Almost surely, 2^21636967468 is an apocalyptic number.

It is an amenable number.

21636967468 is a deficient number, since it is larger than the sum of its proper divisors (18038003252).

21636967468 is a wasteful number, since it uses less digits than its factorization.

21636967468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976137 (or 976135 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 58.

The spelling of 21636967468 in words is "twenty-one billion, six hundred thirty-six million, nine hundred sixty-seven thousand, four hundred sixty-eight".