192820921 has 2 divisors, whose sum is σ = 192820922. Its totient is φ = 192820920.

The previous prime is 192820889. The next prime is 192820997. The reversal of 192820921 is 129028291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144865296 + 47955625 = 12036^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 192820921 - 2⁵ = 192820889 is a prime.

It is not a weakly prime, because it can be changed into another prime (192820321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96410460 + 96410461.

It is an arithmetic number, because the mean of its divisors is an integer number (96410461).

Almost surely, 2^192820921 is an apocalyptic number.

It is an amenable number.

192820921 is a deficient number, since it is larger than the sum of its proper divisors (1).

192820921 is an equidigital number, since it uses as much as digits as its factorization.

192820921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 192820921 is about 13885.9972994380. The cubic root of 192820921 is about 577.7208625300.

The spelling of 192820921 in words is "one hundred ninety-two million, eight hundred twenty thousand, nine hundred twenty-one".