21233020767967 has 2 divisors, whose sum is σ = 21233020767968. Its totient is φ = 21233020767966.

The previous prime is 21233020767919. The next prime is 21233020767983. The reversal of 21233020767967 is 76976702033212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233020767967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233020767467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616510383983 + 10616510383984.

It is an arithmetic number, because the mean of its divisors is an integer number (10616510383984).

Almost surely, 2^{21233020767967} is an apocalyptic number.

21233020767967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233020767967 is an equidigital number, since it uses as much as digits as its factorization.

21233020767967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8001504, while the sum is 55.

The spelling of 21233020767967 in words is "twenty-one trillion, two hundred thirty-three billion, twenty million, seven hundred sixty-seven thousand, nine hundred sixty-seven".