16961479921 has 16 divisors (see below), whose sum is σ = 18056304000. Its totient is φ = 15877686528.

The previous prime is 16961479907. The next prime is 16961479933. The reversal of 16961479921 is 12997416961.

It is a cyclic number.

It is not a de Polignac number, because 16961479921 - 2⁵ = 16961479889 is a prime.

It is a super-2 number, since 2×16961479921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16961479901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2482516 + ... + 2489338.

It is an arithmetic number, because the mean of its divisors is an integer number (1128519000).

Almost surely, 2^16961479921 is an apocalyptic number.

It is an amenable number.

16961479921 is a deficient number, since it is larger than the sum of its proper divisors (1094824079).

16961479921 is a wasteful number, since it uses less digits than its factorization.

16961479921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7608.

The product of its digits is 1469664, while the sum is 55.

It can be divided in two parts, 16961479 and 921, that added together give a triangular number (16962400 = T₅₈₂₄).

The spelling of 16961479921 in words is "sixteen billion, nine hundred sixty-one million, four hundred seventy-nine thousand, nine hundred twenty-one".