16979270840621 has 2 divisors, whose sum is σ = 16979270840622. Its totient is φ = 16979270840620.

The previous prime is 16979270840569. The next prime is 16979270840639. The reversal of 16979270840621 is 12604807297961.

16979270840621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15712939242025 + 1266331598596 = 3963955^2 + 1125314^2 .

It is a cyclic number.

It is not a de Polignac number, because 16979270840621 - 2⁶ = 16979270840557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16979270840641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8489635420310 + 8489635420311.

It is an arithmetic number, because the mean of its divisors is an integer number (8489635420311).

Almost surely, 2^{16979270840621} is an apocalyptic number.

It is an amenable number.

16979270840621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16979270840621 is an equidigital number, since it uses as much as digits as its factorization.

16979270840621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 16979270840621 in words is "sixteen trillion, nine hundred seventy-nine billion, two hundred seventy million, eight hundred forty thousand, six hundred twenty-one".