21311321013031 has 16 divisors (see below), whose sum is σ = 24950325254400. Its totient is φ = 17820966582720.

The previous prime is 21311321012941. The next prime is 21311321013041. The reversal of 21311321013031 is 13031012311312.

It is not a de Polignac number, because 21311321013031 - 2¹¹ = 21311321010983 is a prime.

It is a super-2 number, since 2×21311321013031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21311321012993 and 21311321013011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311321013041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14600220 + ... + 15993406.

It is an arithmetic number, because the mean of its divisors is an integer number (1559395328400).

Almost surely, 2^{21311321013031} is an apocalyptic number.

21311321013031 is a deficient number, since it is larger than the sum of its proper divisors (3639004241369).

21311321013031 is a wasteful number, since it uses less digits than its factorization.

21311321013031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446534.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21311321013031 its reverse (13031012311312), we get a palindrome (34342333324343).

The spelling of 21311321013031 in words is "twenty-one trillion, three hundred eleven billion, three hundred twenty-one million, thirteen thousand, thirty-one".