1021130999 has 4 divisors (see below), whose sum is σ = 1167006864. Its totient is φ = 875255136.

The previous prime is 1021130951. The next prime is 1021131029. The reversal of 1021130999 is 9990311201.

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

It is a de Polignac number, because none of the positive numbers 2^k-1021130999 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 (1021130599) 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, 72937922 + ... + 72937935.

It is an arithmetic number, because the mean of its divisors is an integer number (291751716).

Almost surely, 2^1021130999 is an apocalyptic number.

1021130999 is a deficient number, since it is larger than the sum of its proper divisors (145875865).

1021130999 is an equidigital number, since it uses as much as digits as its factorization.

1021130999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145875864.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1021130999 is about 31955.1404159018. The cubic root of 1021130999 is about 1006.9946274499.

The spelling of 1021130999 in words is "one billion, twenty-one million, one hundred thirty thousand, nine hundred ninety-nine".