90885879734921 has 4 divisors (see below), whose sum is σ = 90885918960144. Its totient is φ = 90885840509700.

The previous prime is 90885879734891. The next prime is 90885879734929. The reversal of 90885879734921 is 12943797858809.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90885879734921 - 2⁴⁶ = 20517135557257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90885879734929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15903215 + ... + 20849076.

It is an arithmetic number, because the mean of its divisors is an integer number (22721479740036).

Almost surely, 2^{90885879734921} is an apocalyptic number.

It is an amenable number.

90885879734921 is a deficient number, since it is larger than the sum of its proper divisors (39225223).

90885879734921 is a wasteful number, since it uses less digits than its factorization.

90885879734921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39225222.

The product of its (nonzero) digits is 2194698240, while the sum is 80.

The spelling of 90885879734921 in words is "ninety trillion, eight hundred eighty-five billion, eight hundred seventy-nine million, seven hundred thirty-four thousand, nine hundred twenty-one".