211222312 has 64 divisors (see below), whose sum is σ = 472780800. Its totient is φ = 86553600.

The previous prime is 211222309. The next prime is 211222337. The reversal of 211222312 is 213222112.

It is a happy number.

It is a super-2 number, since 2×211222312² = 89229730173250688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182937 + ... + 184087.

It is an arithmetic number, because the mean of its divisors is an integer number (7387200).

Almost surely, 2^211222312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211222312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236390400).

211222312 is an abundant number, since it is smaller than the sum of its proper divisors (261558488).

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

211222312 is a wasteful number, since it uses less digits than its factorization.

211222312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306 (or 1302 counting only the distinct ones).

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

The square root of 211222312 is about 14533.4893263800. The cubic root of 211222312 is about 595.5431915476.

Adding to 211222312 its reverse (213222112), we get a palindrome (424444424).

The spelling of 211222312 in words is "two hundred eleven million, two hundred twenty-two thousand, three hundred twelve".