21227064959 has 2 divisors, whose sum is σ = 21227064960. Its totient is φ = 21227064958.

The previous prime is 21227064923. The next prime is 21227064997. The reversal of 21227064959 is 95946072212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21227064959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21227064919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613532479 + 10613532480.

It is an arithmetic number, because the mean of its divisors is an integer number (10613532480).

Almost surely, 2^21227064959 is an apocalyptic number.

21227064959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227064959 is an equidigital number, since it uses as much as digits as its factorization.

21227064959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 21227064959 in words is "twenty-one billion, two hundred twenty-seven million, sixty-four thousand, nine hundred fifty-nine".