211121211210 has 64 divisors (see below), whose sum is σ = 623619585792. Its totient is φ = 44544254976.

The previous prime is 211121211199. The next prime is 211121211283. The reversal of 211121211210 is 12112121112.

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 211121211210.

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, 38664159 + ... + 38669618.

It is an arithmetic number, because the mean of its divisors is an integer number (9744056028).

Almost surely, 2^211121211210 is an apocalyptic number.

211121211210 is an abundant number, since it is smaller than the sum of its proper divisors (412498374582).

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

211121211210 is a wasteful number, since it uses less digits than its factorization.

211121211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77333807.

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

Adding to 211121211210 its reverse (12112121112), we get a palindrome (223233332322).

The spelling of 211121211210 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred eleven thousand, two hundred ten".