211222210 has 8 divisors (see below), whose sum is σ = 380199996. Its totient is φ = 84488880.

The previous prime is 211222169. The next prime is 211222211. The reversal of 211222210 is 12222112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 180983209 + 30239001 = 13453^2 + 5499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211222210² = 89229643994568200, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 10561101 + ... + 10561120.

Almost surely, 2^211222210 is an apocalyptic number.

211222210 is a deficient number, since it is larger than the sum of its proper divisors (168977786).

211222210 is a wasteful number, since it uses less digits than its factorization.

211222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21122228.

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

The square root of 211222210 is about 14533.4858172429. The cubic root of 211222210 is about 595.5430956842.

Adding to 211222210 its reverse (12222112), we get a palindrome (223444322).

It can be divided in two parts, 21122 and 2210, that added together give a palindrome (23332).

The spelling of 211222210 in words is "two hundred eleven million, two hundred twenty-two thousand, two hundred ten".