1211111211210 has 32 divisors (see below), whose sum is σ = 2910074549760. Its totient is φ = 322584362688.

The previous prime is 1211111211187. The next prime is 1211111211223. The reversal of 1211111211210 is 121121111121.

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 1211111211210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23638170 + ... + 23689349.

It is an arithmetic number, because the mean of its divisors is an integer number (90939829680).

Almost surely, 2^{1211111211210} is an apocalyptic number.

1211111211210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211111211210 is an abundant number, since it is smaller than the sum of its proper divisors (1698963338550).

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

1211111211210 is a wasteful number, since it uses less digits than its factorization.

1211111211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47328382.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211111211210 its reverse (121121111121), we get a palindrome (1332232322331).

The spelling of 1211111211210 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred eleven thousand, two hundred ten".