90220521881 has 16 divisors (see below), whose sum is σ = 105342693120. Its totient is φ = 75674649600.

The previous prime is 90220521877. The next prime is 90220521883. The reversal of 90220521881 is 18812502209.

It is a cyclic number.

It is not a de Polignac number, because 90220521881 - 2² = 90220521877 is a prime.

It is a super-2 number, since 2×90220521881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90220521883) 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, 686045 + ... + 806906.

It is an arithmetic number, because the mean of its divisors is an integer number (6583918320).

Almost surely, 2^90220521881 is an apocalyptic number.

It is an amenable number.

90220521881 is a deficient number, since it is larger than the sum of its proper divisors (15122171239).

90220521881 is a wasteful number, since it uses less digits than its factorization.

90220521881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493144.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 90220521881 in words is "ninety billion, two hundred twenty million, five hundred twenty-one thousand, eight hundred eighty-one".