9990542342521 has 8 divisors (see below), whose sum is σ = 10859597429184. Its totient is φ = 9135851802960.

The previous prime is 9990542342497. The next prime is 9990542342527. The reversal of 9990542342521 is 1252432450999.

9990542342521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9990542342521 - 2⁹ = 9990542342009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9990542342527) 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, 3591135325 + ... + 3591138106.

It is an arithmetic number, because the mean of its divisors is an integer number (1357449678648).

Almost surely, 2^{9990542342521} is an apocalyptic number.

It is an amenable number.

9990542342521 is a deficient number, since it is larger than the sum of its proper divisors (869055086663).

9990542342521 is a wasteful number, since it uses less digits than its factorization.

9990542342521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7182273551.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 9990542342521 in words is "nine trillion, nine hundred ninety billion, five hundred forty-two million, three hundred forty-two thousand, five hundred twenty-one".