21616206106544 has 40 divisors (see below), whose sum is σ = 49031882154528. Its totient is φ = 9038134955520.

The previous prime is 21616206106529. The next prime is 21616206106603. The reversal of 21616206106544 is 44560160261612.

It is a junction number, because it is equal to n+sod(n) for n = 21616206106495 and 21616206106504.

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, 2353676387 + ... + 2353685570.

Almost surely, 2^{21616206106544} is an apocalyptic number.

It is an amenable number.

21616206106544 is an abundant number, since it is smaller than the sum of its proper divisors (27415676047984).

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

21616206106544 is a wasteful number, since it uses less digits than its factorization.

21616206106544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4707362013 (or 4707362007 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 21616206106544 in words is "twenty-one trillion, six hundred sixteen billion, two hundred six million, one hundred six thousand, five hundred forty-four".