211222212 has 24 divisors (see below), whose sum is σ = 521843616. Its totient is φ = 66265728.

The previous prime is 211222211. The next prime is 211222217. The reversal of 211222212 is 212222112.

It is a super-2 number, since 2×211222212² = 89229645684345888, which 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 = 211222191 and 211222200.

It is not an unprimeable number, because it can be changed into a prime (211222211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517498 + ... + 517905.

It is an arithmetic number, because the mean of its divisors is an integer number (21743484).

Almost surely, 2^211222212 is an apocalyptic number.

It is an amenable number.

211222212 is an abundant number, since it is smaller than the sum of its proper divisors (310621404).

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

211222212 is a wasteful number, since it uses less digits than its factorization.

211222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035427 (or 1035425 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 211222212 is about 14533.4858860495. The cubic root of 211222212 is about 595.5430975639.

Adding to 211222212 its reverse (212222112), we get a palindrome (423444324).

The spelling of 211222212 in words is "two hundred eleven million, two hundred twenty-two thousand, two hundred twelve".