990021120001 has 16 divisors (see below), whose sum is σ = 1005960513600. Its totient is φ = 974195200000.

The previous prime is 990021119993. The next prime is 990021120017. The reversal of 990021120001 is 100021120099.

It is a cyclic number.

It is not a de Polignac number, because 990021120001 - 2³ = 990021119993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990021120031) 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 15 ways as a sum of consecutive naturals, for example, 28107201 + ... + 28142401.

It is an arithmetic number, because the mean of its divisors is an integer number (62872532100).

Almost surely, 2^990021120001 is an apocalyptic number.

It is an amenable number.

990021120001 is a deficient number, since it is larger than the sum of its proper divisors (15939393599).

990021120001 is a wasteful number, since it uses less digits than its factorization.

990021120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36800.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 990021120001 in words is "nine hundred ninety billion, twenty-one million, one hundred twenty thousand, one".