211220212 has 12 divisors (see below), whose sum is σ = 422440480. Its totient is φ = 90522936.

The previous prime is 211220153. The next prime is 211220231. The reversal of 211220212 is 212022112.

It is a happy number.

211220212 is an admirable number.

It is a super-2 number, since 2×211220212² = 89227955914649888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220192 and 211220201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3771762 + ... + 3771817.

Almost surely, 2^211220212 is an apocalyptic number.

It is an amenable number.

211220212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

211220212 is a wasteful number, since it uses less digits than its factorization.

211220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7543590 (or 7543588 counting only the distinct ones).

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

The square root of 211220212 is about 14533.4170792694. The cubic root of 211220212 is about 595.5412178848.

Adding to 211220212 its reverse (212022112), we get a palindrome (423242324).

The spelling of 211220212 in words is "two hundred eleven million, two hundred twenty thousand, two hundred twelve".