1022120999 has 4 divisors (see below), whose sum is σ = 1022518080. Its totient is φ = 1021723920.

The previous prime is 1022120987. The next prime is 1022121011. The reversal of 1022120999 is 9990212201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1022120987) and next prime (1022121011).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022120999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022126999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194654 + ... + 199835.

It is an arithmetic number, because the mean of its divisors is an integer number (255629520).

Almost surely, 2^1022120999 is an apocalyptic number.

1022120999 is a deficient number, since it is larger than the sum of its proper divisors (397081).

1022120999 is an equidigital number, since it uses as much as digits as its factorization.

1022120999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397080.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 1022120999 is about 31970.6271286630. The cubic root of 1022120999 is about 1007.3199538701.

The spelling of 1022120999 in words is "one billion, twenty-two million, one hundred twenty thousand, nine hundred ninety-nine".