21140323031 has 2 divisors, whose sum is σ = 21140323032. Its totient is φ = 21140323030.

The previous prime is 21140322967. The next prime is 21140323037. The reversal of 21140323031 is 13032304112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21140323031 - 2⁶ = 21140322967 is a prime.

It is a super-2 number, since 2×21140323031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21140322994 and 21140323012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140323037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570161515 + 10570161516.

It is an arithmetic number, because the mean of its divisors is an integer number (10570161516).

Almost surely, 2^21140323031 is an apocalyptic number.

21140323031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140323031 is an equidigital number, since it uses as much as digits as its factorization.

21140323031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21140323031 its reverse (13032304112), we get a palindrome (34172627143).

The spelling of 21140323031 in words is "twenty-one billion, one hundred forty million, three hundred twenty-three thousand, thirty-one".