1221234099 has 32 divisors (see below), whose sum is σ = 1718601984. Its totient is φ = 770394240.

The previous prime is 1221234089. The next prime is 1221234103. The reversal of 1221234099 is 9904321221.

It is not a de Polignac number, because 1221234099 - 2⁵ = 1221234067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221234089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1579477 + ... + 1580249.

It is an arithmetic number, because the mean of its divisors is an integer number (53706312).

Almost surely, 2^1221234099 is an apocalyptic number.

1221234099 is a deficient number, since it is larger than the sum of its proper divisors (497367885).

1221234099 is a wasteful number, since it uses less digits than its factorization.

1221234099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1221234099 is about 34946.1600036399. The cubic root of 1221234099 is about 1068.8899014834.

The spelling of 1221234099 in words is "one billion, two hundred twenty-one million, two hundred thirty-four thousand, ninety-nine".