21616040344544 has 24 divisors (see below), whose sum is σ = 44024047686360. Its totient is φ = 10435329821056.

The previous prime is 21616040344529. The next prime is 21616040344559. The reversal of 21616040344544 is 44544304061612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21616040344529) and next prime (21616040344559).

It is a junction number, because it is equal to n+sod(n) for n = 21616040344495 and 21616040344504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11646572534 + ... + 11646574389.

It is an arithmetic number, because the mean of its divisors is an integer number (1834335320265).

Almost surely, 2^{21616040344544} is an apocalyptic number.

It is an amenable number.

21616040344544 is an abundant number, since it is smaller than the sum of its proper divisors (22408007341816).

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

21616040344544 is a wasteful number, since it uses less digits than its factorization.

21616040344544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23293146962 (or 23293146954 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 44.

The spelling of 21616040344544 in words is "twenty-one trillion, six hundred sixteen billion, forty million, three hundred forty-four thousand, five hundred forty-four".