21301111331 has 2 divisors, whose sum is σ = 21301111332. Its totient is φ = 21301111330.

The previous prime is 21301111327. The next prime is 21301111343. The reversal of 21301111331 is 13311110312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21301111331 - 2² = 21301111327 is a prime.

It is a super-2 number, since 2×21301111331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21301011331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650555665 + 10650555666.

It is an arithmetic number, because the mean of its divisors is an integer number (10650555666).

Almost surely, 2^21301111331 is an apocalyptic number.

21301111331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301111331 is an equidigital number, since it uses as much as digits as its factorization.

21301111331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21301111331 its reverse (13311110312), we get a palindrome (34612221643).

The spelling of 21301111331 in words is "twenty-one billion, three hundred one million, one hundred eleven thousand, three hundred thirty-one".