202120123291 has 2 divisors, whose sum is σ = 202120123292. Its totient is φ = 202120123290.

The previous prime is 202120123253. The next prime is 202120123301. The reversal of 202120123291 is 192321021202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 202120123291 - 2³⁵ = 167760384923 is a prime.

It is not a weakly prime, because it can be changed into another prime (202120123691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060061645 + 101060061646.

It is an arithmetic number, because the mean of its divisors is an integer number (101060061646).

Almost surely, 2^202120123291 is an apocalyptic number.

202120123291 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120123291 is an equidigital number, since it uses as much as digits as its factorization.

202120123291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 202120123291 its reverse (192321021202), we get a palindrome (394441144493).

The spelling of 202120123291 in words is "two hundred two billion, one hundred twenty million, one hundred twenty-three thousand, two hundred ninety-one".