1211223211110 has 128 divisors (see below), whose sum is σ = 3523930099200. Its totient is φ = 293598898560.

The previous prime is 1211223211109. The next prime is 1211223211147. The reversal of 1211223211110 is 111123221121.

It is a happy number.

1211223211110 is a `hidden beast` number, since 1 + 211 + 22 + 321 + 1 + 110 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41883336 + ... + 41912244.

It is an arithmetic number, because the mean of its divisors is an integer number (27530703900).

Almost surely, 2^{1211223211110} is an apocalyptic number.

1211223211110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211223211110 is an abundant number, since it is smaller than the sum of its proper divisors (2312706888090).

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

1211223211110 is a wasteful number, since it uses less digits than its factorization.

1211223211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43043 (or 43037 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211223211110 its reverse (111123221121), we get a palindrome (1322346432231).

The spelling of 1211223211110 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, two hundred eleven thousand, one hundred ten".