1200221099 has 16 divisors (see below), whose sum is σ = 1497194496. Its totient is φ = 934728000.

The previous prime is 1200221081. The next prime is 1200221107. The reversal of 1200221099 is 9901220021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1200221099 - 2⁸ = 1200220843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200221069) 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, 203999 + ... + 209799.

It is an arithmetic number, because the mean of its divisors is an integer number (93574656).

Almost surely, 2^1200221099 is an apocalyptic number.

1200221099 is a deficient number, since it is larger than the sum of its proper divisors (296973397).

1200221099 is a wasteful number, since it uses less digits than its factorization.

1200221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506.

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

The square root of 1200221099 is about 34644.2072935722. The cubic root of 1200221099 is about 1062.7238298266.

It can be divided in two parts, 120022 and 1099, that added together give a palindrome (121121).

The spelling of 1200221099 in words is "one billion, two hundred million, two hundred twenty-one thousand, ninety-nine".