211212210 has 64 divisors (see below), whose sum is σ = 558555264. Its totient is φ = 50688000.

The previous prime is 211212203. The next prime is 211212241. The reversal of 211212210 is 12212112.

It is a super-2 number, since 2×211212210² = 89221195306168200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30162 + ... + 36498.

It is an arithmetic number, because the mean of its divisors is an integer number (8727426).

Almost surely, 2^211212210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211212210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279277632).

211212210 is an abundant number, since it is smaller than the sum of its proper divisors (347343054).

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

211212210 is a wasteful number, since it uses less digits than its factorization.

211212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 211212210 is about 14533.1417800832. The cubic root of 211212210 is about 595.5336971699.

Adding to 211212210 its reverse (12212112), we get a palindrome (223424322).

The spelling of 211212210 in words is "two hundred eleven million, two hundred twelve thousand, two hundred ten".