22031631421 has 2 divisors, whose sum is σ = 22031631422. Its totient is φ = 22031631420.

The previous prime is 22031631367. The next prime is 22031631449. The reversal of 22031631421 is 12413613022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15572294521 + 6459336900 = 124789^2 + 80370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22031631421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22031631121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11015815710 + 11015815711.

It is an arithmetic number, because the mean of its divisors is an integer number (11015815711).

Almost surely, 2^22031631421 is an apocalyptic number.

It is an amenable number.

22031631421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22031631421 is an equidigital number, since it uses as much as digits as its factorization.

22031631421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 22031631421 in words is "twenty-two billion, thirty-one million, six hundred thirty-one thousand, four hundred twenty-one".