1220120099 has 16 divisors (see below), whose sum is σ = 1348722144. Its totient is φ = 1094553600.

The previous prime is 1220120089. The next prime is 1220120113. The reversal of 1220120099 is 9900210221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220120099 - 2²⁴ = 1203342883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220120089) 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, 297527 + ... + 301599.

It is an arithmetic number, because the mean of its divisors is an integer number (84295134).

Almost surely, 2^1220120099 is an apocalyptic number.

1220120099 is a deficient number, since it is larger than the sum of its proper divisors (128602045).

1220120099 is a wasteful number, since it uses less digits than its factorization.

1220120099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1220120099 is about 34930.2175630213. The cubic root of 1220120099 is about 1068.5647916629.

The spelling of 1220120099 in words is "one billion, two hundred twenty million, one hundred twenty thousand, ninety-nine".