212840311 has 2 divisors, whose sum is σ = 212840312. Its totient is φ = 212840310.

The previous prime is 212840293. The next prime is 212840351. The reversal of 212840311 is 113048212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212840311 - 2⁵ = 212840279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212840351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106420155 + 106420156.

It is an arithmetic number, because the mean of its divisors is an integer number (106420156).

Almost surely, 2^212840311 is an apocalyptic number.

212840311 is a deficient number, since it is larger than the sum of its proper divisors (1).

212840311 is an equidigital number, since it uses as much as digits as its factorization.

212840311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 212840311 is about 14589.0476385541. The cubic root of 212840311 is about 597.0599793651.

Adding to 212840311 its reverse (113048212), we get a palindrome (325888523).

The spelling of 212840311 in words is "two hundred twelve million, eight hundred forty thousand, three hundred eleven".