16720121277 has 32 divisors (see below), whose sum is σ = 26098380800. Its totient is φ = 10550309616.

The previous prime is 16720121273. The next prime is 16720121309. The reversal of 16720121277 is 77212102761.

16720121277 is a `hidden beast` number, since 167 + 201 + 21 + 277 = 666.

It is not a de Polignac number, because 16720121277 - 2² = 16720121273 is a prime.

It is a super-2 number, since 2×16720121277² (a number of 21 digits) contains 22 as substring.

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 (16720121273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561588 + ... + 590610.

It is an arithmetic number, because the mean of its divisors is an integer number (815574400).

Almost surely, 2^16720121277 is an apocalyptic number.

It is an amenable number.

16720121277 is a deficient number, since it is larger than the sum of its proper divisors (9378259523).

16720121277 is a wasteful number, since it uses less digits than its factorization.

16720121277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30174 (or 30168 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The spelling of 16720121277 in words is "sixteen billion, seven hundred twenty million, one hundred twenty-one thousand, two hundred seventy-seven".