212220331 has 2 divisors, whose sum is σ = 212220332. Its totient is φ = 212220330.

The previous prime is 212220313. The next prime is 212220341. The reversal of 212220331 is 133022212.

Together with previous prime (212220313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212220331 - 2²³ = 203831723 is a prime.

It is a super-2 number, since 2×212220331² = 90074937779499122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212220341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110165 + 106110166.

It is an arithmetic number, because the mean of its divisors is an integer number (106110166).

Almost surely, 2^212220331 is an apocalyptic number.

212220331 is a deficient number, since it is larger than the sum of its proper divisors (1).

212220331 is an equidigital number, since it uses as much as digits as its factorization.

212220331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 212220331 is about 14567.7840113038. The cubic root of 212220331 is about 596.4796926020.

Adding to 212220331 its reverse (133022212), we get a palindrome (345242543).

The spelling of 212220331 in words is "two hundred twelve million, two hundred twenty thousand, three hundred thirty-one".