1121220987 has 4 divisors (see below), whose sum is σ = 1494961320. Its totient is φ = 747480656.

The previous prime is 1121220967. The next prime is 1121221019. The reversal of 1121220987 is 7890221211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890221211 = 3 ⋅2630073737.

It is a cyclic number.

It is not a de Polignac number, because 1121220987 - 2⁶ = 1121220923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121220967) 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 3 ways as a sum of consecutive naturals, for example, 186870162 + ... + 186870167.

It is an arithmetic number, because the mean of its divisors is an integer number (373740330).

Almost surely, 2^1121220987 is an apocalyptic number.

1121220987 is a deficient number, since it is larger than the sum of its proper divisors (373740333).

1121220987 is an equidigital number, since it uses as much as digits as its factorization.

1121220987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373740332.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1121220987 is about 33484.6380747948. The cubic root of 1121220987 is about 1038.8760623533.

The spelling of 1121220987 in words is "one billion, one hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-seven".