7990111021 has 8 divisors (see below), whose sum is σ = 8419638080. Its totient is φ = 7561483488.

The previous prime is 7990110941. The next prime is 7990111069. The reversal of 7990111021 is 1201110997.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7990111021 - 2⁹ = 7990110509 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 (7990111321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206601 + ... + 242206.

It is an arithmetic number, because the mean of its divisors is an integer number (1052454760).

Almost surely, 2^7990111021 is an apocalyptic number.

It is an amenable number.

7990111021 is a deficient number, since it is larger than the sum of its proper divisors (429527059).

7990111021 is a wasteful number, since it uses less digits than its factorization.

7990111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449763.

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 7990111021 is about 89387.4209327017. The cubic root of 7990111021 is about 1999.1755786281.

The spelling of 7990111021 in words is "seven billion, nine hundred ninety million, one hundred eleven thousand, twenty-one".