21112122331 has 2 divisors, whose sum is σ = 21112122332. Its totient is φ = 21112122330.

The previous prime is 21112122319. The next prime is 21112122341. The reversal of 21112122331 is 13322121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112122331 - 2⁷ = 21112122203 is a prime.

It is a super-2 number, since 2×21112122331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112122299 and 21112122308.

It is not a weakly prime, because it can be changed into another prime (21112122341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556061165 + 10556061166.

It is an arithmetic number, because the mean of its divisors is an integer number (10556061166).

Almost surely, 2^21112122331 is an apocalyptic number.

21112122331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112122331 is an equidigital number, since it uses as much as digits as its factorization.

21112122331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 21112122331 its reverse (13322121112), we get a palindrome (34434243443).

The spelling of 21112122331 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, three hundred thirty-one".