90020020221 has 16 divisors (see below), whose sum is σ = 133380649600. Its totient is φ = 60005401344.

The previous prime is 90020020217. The next prime is 90020020247. The reversal of 90020020221 is 12202002009.

It is not a de Polignac number, because 90020020221 - 2² = 90020020217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90020020194 and 90020020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90020020261) 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, 9316 + ... + 424413.

It is an arithmetic number, because the mean of its divisors is an integer number (8336290600).

Almost surely, 2^90020020221 is an apocalyptic number.

It is an amenable number.

90020020221 is a deficient number, since it is larger than the sum of its proper divisors (43360629379).

90020020221 is a wasteful number, since it uses less digits than its factorization.

90020020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441425 (or 441419 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The spelling of 90020020221 in words is "ninety billion, twenty million, twenty thousand, two hundred twenty-one".