990299021 has 8 divisors (see below), whose sum is σ = 996521400. Its totient is φ = 984096000.

The previous prime is 990299003. The next prime is 990299027. The reversal of 990299021 is 120992099.

990299021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 38576521 + 951722500 = 6211^2 + 30850^2 .

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 990299021 - 2⁶ = 990298957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990299021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990299027) 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, 105521 + ... + 114521.

It is an arithmetic number, because the mean of its divisors is an integer number (124565175).

Almost surely, 2^990299021 is an apocalyptic number.

It is an amenable number.

990299021 is a deficient number, since it is larger than the sum of its proper divisors (6222379).

990299021 is a wasteful number, since it uses less digits than its factorization.

990299021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9679.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 990299021 is about 31469.0168419670. The cubic root of 990299021 is about 996.7558270565.

The spelling of 990299021 in words is "nine hundred ninety million, two hundred ninety-nine thousand, twenty-one".