21968233277 has 2 divisors, whose sum is σ = 21968233278. Its totient is φ = 21968233276.

The previous prime is 21968233253. The next prime is 21968233303. The reversal of 21968233277 is 77233286912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20169964441 + 1798268836 = 142021^2 + 42406^2 .

It is a cyclic number.

It is not a de Polignac number, because 21968233277 - 2⁶ = 21968233213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21968233477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10984116638 + 10984116639.

It is an arithmetic number, because the mean of its divisors is an integer number (10984116639).

Almost surely, 2^21968233277 is an apocalyptic number.

It is an amenable number.

21968233277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21968233277 is an equidigital number, since it uses as much as digits as its factorization.

21968233277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The spelling of 21968233277 in words is "twenty-one billion, nine hundred sixty-eight million, two hundred thirty-three thousand, two hundred seventy-seven".