21097601279 has 2 divisors, whose sum is σ = 21097601280. Its totient is φ = 21097601278.

The previous prime is 21097601269. The next prime is 21097601321. The reversal of 21097601279 is 97210679012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21097601279 - 2²⁸ = 20829165823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21097601269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548800639 + 10548800640.

It is an arithmetic number, because the mean of its divisors is an integer number (10548800640).

Almost surely, 2^21097601279 is an apocalyptic number.

21097601279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21097601279 is an equidigital number, since it uses as much as digits as its factorization.

21097601279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 21097601279 in words is "twenty-one billion, ninety-seven million, six hundred one thousand, two hundred seventy-nine".