21113131331 has 2 divisors, whose sum is σ = 21113131332. Its totient is φ = 21113131330.

The previous prime is 21113131301. The next prime is 21113131339. The reversal of 21113131331 is 13313131112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113131331 - 2¹⁴ = 21113114947 is a prime.

It is a super-2 number, since 2×21113131331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21113131339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556565665 + 10556565666.

It is an arithmetic number, because the mean of its divisors is an integer number (10556565666).

Almost surely, 2^21113131331 is an apocalyptic number.

21113131331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113131331 is an equidigital number, since it uses as much as digits as its factorization.

21113131331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 20.

Adding to 21113131331 its reverse (13313131112), we get a palindrome (34426262443).

The spelling of 21113131331 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-one thousand, three hundred thirty-one".