21310320131131 has 4 divisors (see below), whose sum is σ = 21310940968912. Its totient is φ = 21309699293352.

The previous prime is 21310320131101. The next prime is 21310320131141. The reversal of 21310320131131 is 13113102301312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21310320131131 - 2¹¹ = 21310320129083 is a prime.

It is a super-2 number, since 2×21310320131131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310320131101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310367400 + ... + 310436053.

It is an arithmetic number, because the mean of its divisors is an integer number (5327735242228).

Almost surely, 2^{21310320131131} is an apocalyptic number.

21310320131131 is a deficient number, since it is larger than the sum of its proper divisors (620837781).

21310320131131 is an equidigital number, since it uses as much as digits as its factorization.

21310320131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620837780.

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

Adding to 21310320131131 its reverse (13113102301312), we get a palindrome (34423422432443).

The spelling of 21310320131131 in words is "twenty-one trillion, three hundred ten billion, three hundred twenty million, one hundred thirty-one thousand, one hundred thirty-one".