90011221021 has 8 divisors (see below), whose sum is σ = 90176042880. Its totient is φ = 89846510688.

The previous prime is 90011221009. The next prime is 90011221033. The reversal of 90011221021 is 12012211009.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90011221009) and next prime (90011221033).

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

It is a cyclic number.

It is not a de Polignac number, because 90011221021 - 2⁵ = 90011220989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90011221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90011251021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1682730 + ... + 1735396.

It is an arithmetic number, because the mean of its divisors is an integer number (11272005360).

Almost surely, 2^90011221021 is an apocalyptic number.

It is an amenable number.

90011221021 is a deficient number, since it is larger than the sum of its proper divisors (164821859).

90011221021 is a wasteful number, since it uses less digits than its factorization.

90011221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55763.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 90011221021 in words is "ninety billion, eleven million, two hundred twenty-one thousand, twenty-one".