20722938911 has 2 divisors, whose sum is σ = 20722938912. Its totient is φ = 20722938910.

The previous prime is 20722938893. The next prime is 20722938917. The reversal of 20722938911 is 11983922702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20722938911 - 2²⁶ = 20655830047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20722938917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361469455 + 10361469456.

It is an arithmetic number, because the mean of its divisors is an integer number (10361469456).

Almost surely, 2^20722938911 is an apocalyptic number.

20722938911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20722938911 is an equidigital number, since it uses as much as digits as its factorization.

20722938911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 20722938911 in words is "twenty billion, seven hundred twenty-two million, nine hundred thirty-eight thousand, nine hundred eleven".