211222120 has 16 divisors (see below), whose sum is σ = 475249860. Its totient is φ = 84488832.

The previous prime is 211222111. The next prime is 211222147. The reversal of 211222120 is 21222112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 206267044 + 4955076 = 14362^2 + 2226^2 .

It is a super-2 number, since 2×211222120² = 89229567954588800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211222120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2640237 + ... + 2640316.

Almost surely, 2^211222120 is an apocalyptic number.

211222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211222120 is an abundant number, since it is smaller than the sum of its proper divisors (264027740).

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

211222120 is a wasteful number, since it uses less digits than its factorization.

211222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280564 (or 5280560 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 211222120 is about 14533.4827209448. The cubic root of 211222120 is about 595.5430110989.

Adding to 211222120 its reverse (21222112), we get a palindrome (232444232).

The spelling of 211222120 in words is "two hundred eleven million, two hundred twenty-two thousand, one hundred twenty".