16921861712 has 40 divisors (see below), whose sum is σ = 37553400000. Its totient is φ = 7236052992.

The previous prime is 16921861687. The next prime is 16921861729. The reversal of 16921861712 is 21716812961.

It is a congruent number.

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, 117962 + ... + 218537.

It is an arithmetic number, because the mean of its divisors is an integer number (938835000).

Almost surely, 2^16921861712 is an apocalyptic number.

It is an amenable number.

16921861712 is an abundant number, since it is smaller than the sum of its proper divisors (20631538288).

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

16921861712 is a wasteful number, since it uses less digits than its factorization.

16921861712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336963 (or 336957 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The spelling of 16921861712 in words is "sixteen billion, nine hundred twenty-one million, eight hundred sixty-one thousand, seven hundred twelve".