16677172072021 has 4 divisors (see below), whose sum is σ = 16677326442700. Its totient is φ = 16677017701344.

The previous prime is 16677172071961. The next prime is 16677172072031. The reversal of 16677172072021 is 12027027177661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414414062500 + 16262758009521 = 643750^2 + 4032711^2 .

It is a cyclic number.

It is not a de Polignac number, because 16677172072021 - 2⁷ = 16677172071893 is a prime.

It is a super-2 number, since 2×16677172072021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16677172072031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77023176 + ... + 77239393.

It is an arithmetic number, because the mean of its divisors is an integer number (4169331610675).

Almost surely, 2^{16677172072021} is an apocalyptic number.

It is an amenable number.

16677172072021 is a deficient number, since it is larger than the sum of its proper divisors (154370679).

16677172072021 is a wasteful number, since it uses less digits than its factorization.

16677172072021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154370678.

The product of its (nonzero) digits is 691488, while the sum is 49.

The spelling of 16677172072021 in words is "sixteen trillion, six hundred seventy-seven billion, one hundred seventy-two million, seventy-two thousand, twenty-one".