21228685963 has 2 divisors, whose sum is σ = 21228685964. Its totient is φ = 21228685962.

The previous prime is 21228685957. The next prime is 21228686021. The reversal of 21228685963 is 36958682212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21228685963 - 2²⁹ = 20691815051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21228685963.

It is not a weakly prime, because it can be changed into another prime (21228685663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10614342981 + 10614342982.

It is an arithmetic number, because the mean of its divisors is an integer number (10614342982).

Almost surely, 2^21228685963 is an apocalyptic number.

21228685963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21228685963 is an equidigital number, since it uses as much as digits as its factorization.

21228685963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 52.

The spelling of 21228685963 in words is "twenty-one billion, two hundred twenty-eight million, six hundred eighty-five thousand, nine hundred sixty-three".