211211222222 has 64 divisors (see below), whose sum is σ = 431203820544. Its totient is φ = 74919479040.

The previous prime is 211211222171. The next prime is 211211222239. The reversal of 211211222222 is 222222112112.

It is a super-2 number, since 2×211211222222² (a number of 23 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 211211222194 and 211211222203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 576458 + ... + 868749.

It is an arithmetic number, because the mean of its divisors is an integer number (6737559696).

Almost surely, 2^211211222222 is an apocalyptic number.

211211222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211211222222 is an abundant number, since it is smaller than the sum of its proper divisors (219992598322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211211222222 is a wasteful number, since it uses less digits than its factorization.

211211222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445313.

The product of its digits is 256, while the sum is 20.

Adding to 211211222222 its reverse (222222112112), we get a palindrome (433433334334).

The spelling of 211211222222 in words is "two hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".