21669315938564 has 36 divisors (see below), whose sum is σ = 45739664135424. Its totient is φ = 8798068121328.

The previous prime is 21669315938563. The next prime is 21669315938587. The reversal of 21669315938564 is 46583951396612.

It is a junction number, because it is equal to n+sod(n) for n = 21669315938494 and 21669315938503.

It is not an unprimeable number, because it can be changed into a prime (21669315938563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1071879284 + ... + 1071899499.

It is an arithmetic number, because the mean of its divisors is an integer number (1270546225984).

Almost surely, 2^{21669315938564} is an apocalyptic number.

It is an amenable number.

21669315938564 is an abundant number, since it is smaller than the sum of its proper divisors (24070348196860).

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

21669315938564 is a wasteful number, since it uses less digits than its factorization.

21669315938564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143778832 (or 2143778811 counting only the distinct ones).

The product of its digits is 251942400, while the sum is 68.

The spelling of 21669315938564 in words is "twenty-one trillion, six hundred sixty-nine billion, three hundred fifteen million, nine hundred thirty-eight thousand, five hundred sixty-four".