21112120331 has 2 divisors, whose sum is σ = 21112120332. Its totient is φ = 21112120330.

The previous prime is 21112120307. The next prime is 21112120333. The reversal of 21112120331 is 13302121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112120331 - 2²² = 21107926027 is a prime.

It is a super-2 number, since 2×21112120331² (a number of 21 digits) contains 22 as substring.

Together with 21112120333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21112120333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556060165 + 10556060166.

It is an arithmetic number, because the mean of its divisors is an integer number (10556060166).

Almost surely, 2^21112120331 is an apocalyptic number.

21112120331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112120331 is an equidigital number, since it uses as much as digits as its factorization.

21112120331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112120331 its reverse (13302121112), we get a palindrome (34414241443).

The spelling of 21112120331 in words is "twenty-one billion, one hundred twelve million, one hundred twenty thousand, three hundred thirty-one".