21022313131 has 2 divisors, whose sum is σ = 21022313132. Its totient is φ = 21022313130.

The previous prime is 21022313111. The next prime is 21022313149. The reversal of 21022313131 is 13131322012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21022313131 - 2⁷ = 21022313003 is a prime.

It is a super-2 number, since 2×21022313131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022313099 and 21022313108.

It is not a weakly prime, because it can be changed into another prime (21022313111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511156565 + 10511156566.

It is an arithmetic number, because the mean of its divisors is an integer number (10511156566).

Almost surely, 2^21022313131 is an apocalyptic number.

21022313131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022313131 is an equidigital number, since it uses as much as digits as its factorization.

21022313131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21022313131 its reverse (13131322012), we get a palindrome (34153635143).

It can be divided in two parts, 21022 and 313131, that added together give a triangular number (334153 = T₈₁₇).

The spelling of 21022313131 in words is "twenty-one billion, twenty-two million, three hundred thirteen thousand, one hundred thirty-one".