1221119979 has 32 divisors (see below), whose sum is σ = 1802787840. Its totient is φ = 731292672.

The previous prime is 1221119959. The next prime is 1221120001. The reversal of 1221119979 is 9799111221.

It is not a de Polignac number, because 1221119979 - 2⁸ = 1221119723 is a prime.

It is a super-2 number, since 2×1221119979² = 2982268006225920882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221119979.

It is not an unprimeable number, because it can be changed into a prime (1221119909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 758127 + ... + 759735.

It is an arithmetic number, because the mean of its divisors is an integer number (56337120).

Almost surely, 2^1221119979 is an apocalyptic number.

1221119979 is a deficient number, since it is larger than the sum of its proper divisors (581667861).

1221119979 is a wasteful number, since it uses less digits than its factorization.

1221119979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299.

The product of its digits is 20412, while the sum is 42.

The square root of 1221119979 is about 34944.5271680703. The cubic root of 1221119979 is about 1068.8566057881.

The spelling of 1221119979 in words is "one billion, two hundred twenty-one million, one hundred nineteen thousand, nine hundred seventy-nine".