2111220090 has 96 divisors (see below), whose sum is σ = 6315169536. Its totient is φ = 479347200.

The previous prime is 2111220061. The next prime is 2111220091. The reversal of 2111220090 is 900221112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2111220091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84034 + ... + 106226.

It is an arithmetic number, because the mean of its divisors is an integer number (65783016).

Almost surely, 2^2111220090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2111220090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3157584768).

2111220090 is an abundant number, since it is smaller than the sum of its proper divisors (4203949446).

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

2111220090 is a wasteful number, since it uses less digits than its factorization.

2111220090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22364 (or 22361 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 2111220090 is about 45948.0150822644. The cubic root of 2111220090 is about 1282.8557840130.

The spelling of 2111220090 in words is "two billion, one hundred eleven million, two hundred twenty thousand, ninety".