16721155372 has 12 divisors (see below), whose sum is σ = 29270018736. Its totient is φ = 8358292880.

The previous prime is 16721155369. The next prime is 16721155463. The reversal of 16721155372 is 27355112761.

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, 554683 + ... + 584050.

It is an arithmetic number, because the mean of its divisors is an integer number (2439168228).

Almost surely, 2^16721155372 is an apocalyptic number.

It is an amenable number.

16721155372 is a deficient number, since it is larger than the sum of its proper divisors (12548863364).

16721155372 is a wasteful number, since it uses less digits than its factorization.

16721155372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142408 (or 1142406 counting only the distinct ones).

The product of its digits is 88200, while the sum is 40.

The spelling of 16721155372 in words is "sixteen billion, seven hundred twenty-one million, one hundred fifty-five thousand, three hundred seventy-two".