21398964211 has 2 divisors, whose sum is σ = 21398964212. Its totient is φ = 21398964210.

The previous prime is 21398964179. The next prime is 21398964247. The reversal of 21398964211 is 11246989312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21398964211 - 2⁵ = 21398964179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21398967211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10699482105 + 10699482106.

It is an arithmetic number, because the mean of its divisors is an integer number (10699482106).

Almost surely, 2^21398964211 is an apocalyptic number.

21398964211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21398964211 is an equidigital number, since it uses as much as digits as its factorization.

21398964211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The spelling of 21398964211 in words is "twenty-one billion, three hundred ninety-eight million, nine hundred sixty-four thousand, two hundred eleven".