21100313279 has 2 divisors, whose sum is σ = 21100313280. Its totient is φ = 21100313278.

The previous prime is 21100313239. The next prime is 21100313327. The reversal of 21100313279 is 97231300112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100313279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100313239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550156639 + 10550156640.

It is an arithmetic number, because the mean of its divisors is an integer number (10550156640).

Almost surely, 2^21100313279 is an apocalyptic number.

21100313279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100313279 is an equidigital number, since it uses as much as digits as its factorization.

21100313279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The spelling of 21100313279 in words is "twenty-one billion, one hundred million, three hundred thirteen thousand, two hundred seventy-nine".