16704640020621 has 12 divisors (see below), whose sum is σ = 25909237583232. Its totient is φ = 9545508583128.

The previous prime is 16704640020619. The next prime is 16704640020647. The reversal of 16704640020621 is 12602004640761.

It is not a de Polignac number, because 16704640020621 - 2¹ = 16704640020619 is a prime.

It is a super-4 number, since 4×16704640020621⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16704640020621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16704640020721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56818503325 + ... + 56818503618.

It is an arithmetic number, because the mean of its divisors is an integer number (2159103131936).

Almost surely, 2^{16704640020621} is an apocalyptic number.

It is an amenable number.

16704640020621 is a deficient number, since it is larger than the sum of its proper divisors (9204597562611).

16704640020621 is a wasteful number, since it uses less digits than its factorization.

16704640020621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113637006960 (or 113637006953 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 16704640020621 in words is "sixteen trillion, seven hundred four billion, six hundred forty million, twenty thousand, six hundred twenty-one".