21323331131 has 2 divisors, whose sum is σ = 21323331132. Its totient is φ = 21323331130.

The previous prime is 21323331109. The next prime is 21323331151. The reversal of 21323331131 is 13113332312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323331131 - 2³⁰ = 20249589307 is a prime.

It is a super-2 number, since 2×21323331131² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323331097 and 21323331106.

It is not a weakly prime, because it can be changed into another prime (21323331151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661665565 + 10661665566.

It is an arithmetic number, because the mean of its divisors is an integer number (10661665566).

Almost surely, 2^21323331131 is an apocalyptic number.

21323331131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323331131 is an equidigital number, since it uses as much as digits as its factorization.

21323331131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 23.

Adding to 21323331131 its reverse (13113332312), we get a palindrome (34436663443).

The spelling of 21323331131 in words is "twenty-one billion, three hundred twenty-three million, three hundred thirty-one thousand, one hundred thirty-one".