990320112131021 has 16 divisors (see below), whose sum is σ = 1134132104663040. Its totient is φ = 847092584346480.

The previous prime is 990320112130963. The next prime is 990320112131023. The reversal of 990320112131021 is 120131211023099.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990320112131021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990320112131023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287984156 + ... + 291402666.

It is an arithmetic number, because the mean of its divisors is an integer number (70883256541440).

Almost surely, 2^{990320112131021} is an apocalyptic number.

It is an amenable number.

990320112131021 is a deficient number, since it is larger than the sum of its proper divisors (143811992532019).

990320112131021 is a wasteful number, since it uses less digits than its factorization.

990320112131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503984.

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

The spelling of 990320112131021 in words is "nine hundred ninety trillion, three hundred twenty billion, one hundred twelve million, one hundred thirty-one thousand, twenty-one".