1211031220110 has 16 divisors (see below), whose sum is σ = 2906474928336. Its totient is φ = 322941658688.

The previous prime is 1211031220109. The next prime is 1211031220117. The reversal of 1211031220110 is 110221301121.

It is a super-2 number, since 2×1211031220110² (a number of 25 digits) contains 22 as substring.

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 1211031220110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211031220117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20183853639 + ... + 20183853698.

It is an arithmetic number, because the mean of its divisors is an integer number (181654683021).

Almost surely, 2^{1211031220110} is an apocalyptic number.

1211031220110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211031220110 is an abundant number, since it is smaller than the sum of its proper divisors (1695443708226).

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

1211031220110 is a wasteful number, since it uses less digits than its factorization.

1211031220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40367707347.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1211031220110 its reverse (110221301121), we get a palindrome (1321252521231).

The spelling of 1211031220110 in words is "one trillion, two hundred eleven billion, thirty-one million, two hundred twenty thousand, one hundred ten".