211211220111210 has 48 divisors (see below), whose sum is σ = 599071824318240. Its totient is φ = 51202720026720.

The previous prime is 211211220111193. The next prime is 211211220111247. The reversal of 211211220111210 is 12111022112112.

It is a happy number.

211211220111210 is a `hidden beast` number, since 2 + 1 + 121 + 1 + 220 + 111 + 210 = 666.

211211220111210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211211220111210² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106672332400 + ... + 106672334379.

It is an arithmetic number, because the mean of its divisors is an integer number (12480663006630).

Almost surely, 2^{211211220111210} is an apocalyptic number.

211211220111210 is an abundant number, since it is smaller than the sum of its proper divisors (387860604207030).

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

211211220111210 is a wasteful number, since it uses less digits than its factorization.

211211220111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213344666803 (or 213344666800 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 211211220111210 its reverse (12111022112112), we get a palindrome (223322242223322).

The spelling of 211211220111210 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty million, one hundred eleven thousand, two hundred ten".