16721177044 has 36 divisors (see below), whose sum is σ = 34566708960. Its totient is φ = 7015875360.

The previous prime is 16721177029. The next prime is 16721177087. The reversal of 16721177044 is 44077112761.

It is a junction number, because it is equal to n+sod(n) for n = 16721176988 and 16721177006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1116904 + ... + 1131775.

It is an arithmetic number, because the mean of its divisors is an integer number (960186360).

Almost surely, 2^16721177044 is an apocalyptic number.

It is an amenable number.

16721177044 is an abundant number, since it is smaller than the sum of its proper divisors (17845531916).

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

16721177044 is a wasteful number, since it uses less digits than its factorization.

16721177044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248720 (or 2248705 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 40.

The spelling of 16721177044 in words is "sixteen billion, seven hundred twenty-one million, one hundred seventy-seven thousand, forty-four".