16020921861 has 48 divisors (see below), whose sum is σ = 27857689600. Its totient is φ = 8859443040.

The previous prime is 16020921817. The next prime is 16020921863. The reversal of 16020921861 is 16812902061.

It is not a de Polignac number, because 16020921861 - 2¹⁸ = 16020659717 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16020921863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11991 + ... + 179403.

Almost surely, 2^16020921861 is an apocalyptic number.

It is an amenable number.

16020921861 is a deficient number, since it is larger than the sum of its proper divisors (11836767739).

16020921861 is a wasteful number, since it uses less digits than its factorization.

16020921861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167471 (or 167454 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 16020921861 in words is "sixteen billion, twenty million, nine hundred twenty-one thousand, eight hundred sixty-one".