211312222 has 32 divisors (see below), whose sum is σ = 351500544. Its totient is φ = 95265720.

The previous prime is 211312181. The next prime is 211312223. The reversal of 211312222 is 222213112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 211312196 and 211312205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211312223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433663 + ... + 434149.

It is an arithmetic number, because the mean of its divisors is an integer number (10984392).

Almost surely, 2^211312222 is an apocalyptic number.

211312222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211312222 is a deficient number, since it is larger than the sum of its proper divisors (140188322).

211312222 is a wasteful number, since it uses less digits than its factorization.

211312222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 663 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 211312222 is about 14536.5821980272. The cubic root of 211312222 is about 595.6276802429.

Adding to 211312222 its reverse (222213112), we get a palindrome (433525334).

The spelling of 211312222 in words is "two hundred eleven million, three hundred twelve thousand, two hundred twenty-two".