1221130120 has 32 divisors (see below), whose sum is σ = 3140049600. Its totient is φ = 418673088.

The previous prime is 1221130087. The next prime is 1221130121. The reversal of 1221130120 is 210311221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221130120.

It is not an unprimeable number, because it can be changed into a prime (1221130121) 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, 2180310 + ... + 2180869.

It is an arithmetic number, because the mean of its divisors is an integer number (98126550).

Almost surely, 2^1221130120 is an apocalyptic number.

1221130120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221130120 is an abundant number, since it is smaller than the sum of its proper divisors (1918919480).

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

1221130120 is a wasteful number, since it uses less digits than its factorization.

1221130120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361197 (or 4361193 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221130120 is about 34944.6722691743. The cubic root of 1221130120 is about 1068.8595646141.

Adding to 1221130120 its reverse (210311221), we get a palindrome (1431441341).

The spelling of 1221130120 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, one hundred twenty".