22131431977 has 2 divisors, whose sum is σ = 22131431978. Its totient is φ = 22131431976.

The previous prime is 22131431969. The next prime is 22131431981. The reversal of 22131431977 is 77913413122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18907350016 + 3224081961 = 137504^2 + 56781^2 .

It is a cyclic number.

It is not a de Polignac number, because 22131431977 - 2³ = 22131431969 is a prime.

It is not a weakly prime, because it can be changed into another prime (22131431677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065715988 + 11065715989.

It is an arithmetic number, because the mean of its divisors is an integer number (11065715989).

Almost surely, 2^22131431977 is an apocalyptic number.

It is an amenable number.

22131431977 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131431977 is an equidigital number, since it uses as much as digits as its factorization.

22131431977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The spelling of 22131431977 in words is "twenty-two billion, one hundred thirty-one million, four hundred thirty-one thousand, nine hundred seventy-seven".