90642972921 has 8 divisors (see below), whose sum is σ = 121779872544. Its totient is φ = 59967360960.

The previous prime is 90642972919. The next prime is 90642972967. The reversal of 90642972921 is 12927924609.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90642972921 - 2¹ = 90642972919 is a prime.

It is a super-2 number, since 2×90642972921² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90642973921) 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, 115321456 + ... + 115322241.

It is an arithmetic number, because the mean of its divisors is an integer number (15222484068).

Almost surely, 2^90642972921 is an apocalyptic number.

It is an amenable number.

90642972921 is a deficient number, since it is larger than the sum of its proper divisors (31136899623).

90642972921 is a wasteful number, since it uses less digits than its factorization.

90642972921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230643831.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 90642972921 in words is "ninety billion, six hundred forty-two million, nine hundred seventy-two thousand, nine hundred twenty-one".