192977881792921 has 2 divisors, whose sum is σ = 192977881792922. Its totient is φ = 192977881792920.

The previous prime is 192977881792907. The next prime is 192977881792937. The reversal of 192977881792921 is 129297188779291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183689528410521 + 9288353382400 = 13553211^2 + 3047680^2 .

It is a cyclic number.

It is not a de Polignac number, because 192977881792921 - 2¹⁷ = 192977881661849 is a prime.

It is a super-2 number, since 2×192977881792921² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (192977881792961) 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, 96488940896460 + 96488940896461.

It is an arithmetic number, because the mean of its divisors is an integer number (96488940896461).

Almost surely, 2^{192977881792921} is an apocalyptic number.

It is an amenable number.

192977881792921 is a deficient number, since it is larger than the sum of its proper divisors (1).

192977881792921 is an equidigital number, since it uses as much as digits as its factorization.

192977881792921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152216576, while the sum is 82.

The spelling of 192977881792921 in words is "one hundred ninety-two trillion, nine hundred seventy-seven billion, eight hundred eighty-one million, seven hundred ninety-two thousand, nine hundred twenty-one".