1221110120 has 32 divisors (see below), whose sum is σ = 2763394920. Its totient is φ = 485617920.

The previous prime is 1221110101. The next prime is 1221110123. The reversal of 1221110120 is 210111221.

It can be written as a sum of positive squares in 4 ways, for example, as 1209509284 + 11600836 = 34778^2 + 3406^2 .

It is a super-2 number, since 2×1221110120² = 2982219850332828800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221110123) 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, 81311 + ... + 95150.

Almost surely, 2^1221110120 is an apocalyptic number.

1221110120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221110120 is an abundant number, since it is smaller than the sum of its proper divisors (1542284800).

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

1221110120 is a wasteful number, since it uses less digits than its factorization.

1221110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176645 (or 176641 counting only the distinct ones).

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

The square root of 1221110120 is about 34944.3861013468. The cubic root of 1221110120 is about 1068.8537292251.

Adding to 1221110120 its reverse (210111221), we get a palindrome (1431221341).

The spelling of 1221110120 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty".