1221120110 has 64 divisors (see below), whose sum is σ = 2605547520. Its totient is φ = 403159680.

The previous prime is 1221120107. The next prime is 1221120119. The reversal of 1221120110 is 110211221.

It is a super-2 number, since 2×1221120110² = 2982268646092824200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221120091 and 1221120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1231715 + ... + 1232705.

It is an arithmetic number, because the mean of its divisors is an integer number (40711680).

Almost surely, 2^1221120110 is an apocalyptic number.

1221120110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221120110 is an abundant number, since it is smaller than the sum of its proper divisors (1384427410).

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

1221120110 is a wasteful number, since it uses less digits than its factorization.

1221120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1221120110 is about 34944.5290424696. The cubic root of 1221120110 is about 1068.8566440099.

Adding to 1221120110 its reverse (110211221), we get a palindrome (1331331331).

The spelling of 1221120110 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred ten".