21546412043564 has 24 divisors (see below), whose sum is σ = 38096425753008. Its totient is φ = 10661727605760.

The previous prime is 21546412043549. The next prime is 21546412043627. The reversal of 21546412043564 is 46534021464512.

It is a super-3 number, since 3×21546412043564³ (a number of 41 digits) contains 333 as substring.

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, 9037667 + ... + 11170149.

It is an arithmetic number, because the mean of its divisors is an integer number (1587351073042).

Almost surely, 2^{21546412043564} is an apocalyptic number.

It is an amenable number.

21546412043564 is a deficient number, since it is larger than the sum of its proper divisors (16550013709444).

21546412043564 is a wasteful number, since it uses less digits than its factorization.

21546412043564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158625 (or 2158623 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 21546412043564 in words is "twenty-one trillion, five hundred forty-six billion, four hundred twelve million, forty-three thousand, five hundred sixty-four".