21002132199977 has 2 divisors, whose sum is σ = 21002132199978. Its totient is φ = 21002132199976.

The previous prime is 21002132199899. The next prime is 21002132200079. The reversal of 21002132199977 is 77999123120012.

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., 11614900228096 + 9387231971881 = 3408064^2 + 3063859^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002132199977 - 2²⁰ = 21002131151401 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002132199077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501066099988 + 10501066099989.

It is an arithmetic number, because the mean of its divisors is an integer number (10501066099989).

Almost surely, 2^{21002132199977} is an apocalyptic number.

It is an amenable number.

21002132199977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002132199977 is an equidigital number, since it uses as much as digits as its factorization.

21002132199977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 21002132199977 in words is "twenty-one trillion, two billion, one hundred thirty-two million, one hundred ninety-nine thousand, nine hundred seventy-seven".