1221200111110 has 32 divisors (see below), whose sum is σ = 2549678365440. Its totient is φ = 412447967712.

The previous prime is 1221200111093. The next prime is 1221200111119. The reversal of 1221200111110 is 111110021221.

It is a happy number.

It is a super-2 number, since 2×1221200111110² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221200111119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130187220 + ... + 130196599.

It is an arithmetic number, because the mean of its divisors is an integer number (79677448920).

Almost surely, 2^{1221200111110} is an apocalyptic number.

1221200111110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221200111110 is an abundant number, since it is smaller than the sum of its proper divisors (1328478254330).

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

1221200111110 is a wasteful number, since it uses less digits than its factorization.

1221200111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260383900.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221200111110 its reverse (111110021221), we get a palindrome (1332310132331).

The spelling of 1221200111110 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred eleven thousand, one hundred ten".