21907673701 has 2 divisors, whose sum is σ = 21907673702. Its totient is φ = 21907673700.

The previous prime is 21907673639. The next prime is 21907673717. The reversal of 21907673701 is 10737670912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16655193025 + 5252480676 = 129055^2 + 72474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21907673701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21907673741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10953836850 + 10953836851.

It is an arithmetic number, because the mean of its divisors is an integer number (10953836851).

Almost surely, 2^21907673701 is an apocalyptic number.

It is an amenable number.

21907673701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21907673701 is an equidigital number, since it uses as much as digits as its factorization.

21907673701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 43.

The spelling of 21907673701 in words is "twenty-one billion, nine hundred seven million, six hundred seventy-three thousand, seven hundred one".