20979372361 has 2 divisors, whose sum is σ = 20979372362. Its totient is φ = 20979372360.

The previous prime is 20979372313. The next prime is 20979372371. The reversal of 20979372361 is 16327397902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13717094400 + 7262277961 = 117120^2 + 85219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20979372361 is a prime.

It is a super-2 number, since 2×20979372361² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20979372301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489686180 + 10489686181.

It is an arithmetic number, because the mean of its divisors is an integer number (10489686181).

Almost surely, 2^20979372361 is an apocalyptic number.

It is an amenable number.

20979372361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20979372361 is an equidigital number, since it uses as much as digits as its factorization.

20979372361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 49.

The spelling of 20979372361 in words is "twenty billion, nine hundred seventy-nine million, three hundred seventy-two thousand, three hundred sixty-one".