979990220102021 has 4 divisors (see below), whose sum is σ = 1037636703637452. Its totient is φ = 922343736566592.

The previous prime is 979990220102011. The next prime is 979990220102029. The reversal of 979990220102021 is 120201022099979.

It is a happy number.

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 383173186536100 + 596817033565921 = 19574810^2 + 24429839^2 .

It is a cyclic number.

It is not a de Polignac number, because 979990220102021 - 2⁶ = 979990220101957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979990220102029) 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, 28823241767690 + ... + 28823241767723.

It is an arithmetic number, because the mean of its divisors is an integer number (259409175909363).

Almost surely, 2^{979990220102021} is an apocalyptic number.

It is an amenable number.

979990220102021 is a deficient number, since it is larger than the sum of its proper divisors (57646483535431).

979990220102021 is a wasteful number, since it uses less digits than its factorization.

979990220102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57646483535430.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 979990220102021 in words is "nine hundred seventy-nine trillion, nine hundred ninety billion, two hundred twenty million, one hundred two thousand, twenty-one".