21264445679 has 2 divisors, whose sum is σ = 21264445680. Its totient is φ = 21264445678.

The previous prime is 21264445667. The next prime is 21264445711. The reversal of 21264445679 is 97654446212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21264445679 - 2¹⁶ = 21264380143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21264445079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632222839 + 10632222840.

It is an arithmetic number, because the mean of its divisors is an integer number (10632222840).

Almost surely, 2^21264445679 is an apocalyptic number.

21264445679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21264445679 is an equidigital number, since it uses as much as digits as its factorization.

21264445679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 50.

The spelling of 21264445679 in words is "twenty-one billion, two hundred sixty-four million, four hundred forty-five thousand, six hundred seventy-nine".