22031121997 has 2 divisors, whose sum is σ = 22031121998. Its totient is φ = 22031121996.

The previous prime is 22031121929. The next prime is 22031122049. The reversal of 22031121997 is 79912113022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21558755241 + 472366756 = 146829^2 + 21734^2 .

It is a cyclic number.

It is not a de Polignac number, because 22031121997 - 2¹⁹ = 22030597709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22031125997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11015560998 + 11015560999.

It is an arithmetic number, because the mean of its divisors is an integer number (11015560999).

Almost surely, 2^22031121997 is an apocalyptic number.

It is an amenable number.

22031121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22031121997 is an equidigital number, since it uses as much as digits as its factorization.

22031121997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 22031121997 in words is "twenty-two billion, thirty-one million, one hundred twenty-one thousand, nine hundred ninety-seven".