211122111210 has 64 divisors (see below), whose sum is σ = 508836556800. Its totient is φ = 56061250880.

The previous prime is 211122111209. The next prime is 211122111241. The reversal of 211122111210 is 12111221112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211122111210.

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, 26025055 + ... + 26033165.

It is an arithmetic number, because the mean of its divisors is an integer number (7950571200).

Almost surely, 2^211122111210 is an apocalyptic number.

211122111210 is an abundant number, since it is smaller than the sum of its proper divisors (297714445590).

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

211122111210 is a wasteful number, since it uses less digits than its factorization.

211122111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11683.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211122111210 its reverse (12111221112), we get a palindrome (223233332322).

The spelling of 211122111210 in words is "two hundred eleven billion, one hundred twenty-two million, one hundred eleven thousand, two hundred ten".