1221120079 has 2 divisors, whose sum is σ = 1221120080. Its totient is φ = 1221120078.

The previous prime is 1221120077. The next prime is 1221120107. The reversal of 1221120079 is 9700211221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221120079 - 2¹ = 1221120077 is a prime.

It is a super-2 number, since 2×1221120079² = 2982268494673932482, which contains 22 as substring.

Together with 1221120077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221120077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610560039 + 610560040.

It is an arithmetic number, because the mean of its divisors is an integer number (610560040).

Almost surely, 2^1221120079 is an apocalyptic number.

1221120079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221120079 is an equidigital number, since it uses as much as digits as its factorization.

1221120079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 1221120079 is about 34944.5285989094. The cubic root of 1221120079 is about 1068.8566349650.

The spelling of 1221120079 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, seventy-nine".