21431122039 has 2 divisors, whose sum is σ = 21431122040. Its totient is φ = 21431122038.

The previous prime is 21431122021. The next prime is 21431122049. The reversal of 21431122039 is 93022113412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21431122039 - 2⁹ = 21431121527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21431121998 and 21431122016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21431122049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715561019 + 10715561020.

It is an arithmetic number, because the mean of its divisors is an integer number (10715561020).

Almost surely, 2^21431122039 is an apocalyptic number.

21431122039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431122039 is an equidigital number, since it uses as much as digits as its factorization.

21431122039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21431122039 in words is "twenty-one billion, four hundred thirty-one million, one hundred twenty-two thousand, thirty-nine".