21116543564 has 12 divisors (see below), whose sum is σ = 37505503224. Its totient is φ = 10400685504.

The previous prime is 21116543563. The next prime is 21116543579. The reversal of 21116543564 is 46534561112.

It is not an unprimeable number, because it can be changed into a prime (21116543563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39396269 + ... + 39396804.

It is an arithmetic number, because the mean of its divisors is an integer number (3125458602).

Almost surely, 2^21116543564 is an apocalyptic number.

It is an amenable number.

21116543564 is a deficient number, since it is larger than the sum of its proper divisors (16388959660).

21116543564 is a wasteful number, since it uses less digits than its factorization.

21116543564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78793144 (or 78793142 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The spelling of 21116543564 in words is "twenty-one billion, one hundred sixteen million, five hundred forty-three thousand, five hundred sixty-four".