21002310031 has 2 divisors, whose sum is σ = 21002310032. Its totient is φ = 21002310030.

The previous prime is 21002310011. The next prime is 21002310059. The reversal of 21002310031 is 13001320012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002310031 - 2¹³ = 21002301839 is a prime.

It is a super-2 number, since 2×21002310031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002309993 and 21002310020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002310011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501155015 + 10501155016.

It is an arithmetic number, because the mean of its divisors is an integer number (10501155016).

Almost surely, 2^21002310031 is an apocalyptic number.

21002310031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002310031 is an equidigital number, since it uses as much as digits as its factorization.

21002310031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21002310031 its reverse (13001320012), we get a palindrome (34003630043).

The spelling of 21002310031 in words is "twenty-one billion, two million, three hundred ten thousand, thirty-one".