9021666420 has 144 divisors (see below), whose sum is σ = 31204489680. Its totient is φ = 2090078208.

The previous prime is 9021666397. The next prime is 9021666503. The reversal of 9021666420 is 246661209.

It can be written as a sum of positive squares in 8 ways, for example, as 468376164 + 8553290256 = 21642^2 + 92484^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73615 + ... + 153174.

It is an arithmetic number, because the mean of its divisors is an integer number (216697845).

Almost surely, 2^9021666420 is an apocalyptic number.

9021666420 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9021666420 is an abundant number, since it is smaller than the sum of its proper divisors (22182823260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9021666420 is a wasteful number, since it uses less digits than its factorization.

9021666420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226834 (or 226829 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 9021666420 is about 94982.4532216346. The cubic root of 9021666420 is about 2081.7516694517.

The spelling of 9021666420 in words is "nine billion, twenty-one million, six hundred sixty-six thousand, four hundred twenty".