16221000090 has 64 divisors (see below), whose sum is σ = 39509544960. Its totient is φ = 4261346880.

The previous prime is 16221000071. The next prime is 16221000091. The reversal of 16221000090 is 9000012261.

It is not an unprimeable number, because it can be changed into a prime (16221000091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3974671 + ... + 3978749.

It is an arithmetic number, because the mean of its divisors is an integer number (617336640).

Almost surely, 2^16221000090 is an apocalyptic number.

16221000090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16221000090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19754772480).

16221000090 is an abundant number, since it is smaller than the sum of its proper divisors (23288544870).

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

16221000090 is a wasteful number, since it uses less digits than its factorization.

16221000090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027.

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 16221000090 in words is "sixteen billion, two hundred twenty-one million, ninety", and thus it is an aban number.