16159297921 has 16 divisors (see below), whose sum is σ = 17595857664. Its totient is φ = 14751301824.

The previous prime is 16159297919. The next prime is 16159297937. The reversal of 16159297921 is 12979295161.

It is a cyclic number.

It is not a de Polignac number, because 16159297921 - 2¹ = 16159297919 is a prime.

It is a super-2 number, since 2×16159297921² (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 (16159298921) 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, 408796 + ... + 446578.

It is an arithmetic number, because the mean of its divisors is an integer number (1099741104).

Almost surely, 2^16159297921 is an apocalyptic number.

It is an amenable number.

16159297921 is a deficient number, since it is larger than the sum of its proper divisors (1436559743).

16159297921 is a wasteful number, since it uses less digits than its factorization.

16159297921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38160.

The product of its digits is 612360, while the sum is 52.

The spelling of 16159297921 in words is "sixteen billion, one hundred fifty-nine million, two hundred ninety-seven thousand, nine hundred twenty-one".