21244966879 has 2 divisors, whose sum is σ = 21244966880. Its totient is φ = 21244966878.

The previous prime is 21244966859. The next prime is 21244966909. The reversal of 21244966879 is 97866944212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21244966879 - 2⁷ = 21244966751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21244966859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622483439 + 10622483440.

It is an arithmetic number, because the mean of its divisors is an integer number (10622483440).

Almost surely, 2^21244966879 is an apocalyptic number.

21244966879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244966879 is an equidigital number, since it uses as much as digits as its factorization.

21244966879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 58.

The spelling of 21244966879 in words is "twenty-one billion, two hundred forty-four million, nine hundred sixty-six thousand, eight hundred seventy-nine".