2121223110 has 128 divisors (see below), whose sum is σ = 5555049984. Its totient is φ = 516311040.

The previous prime is 2121223103. The next prime is 2121223121. The reversal of 2121223110 is 113221212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2121223110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4319965 + ... + 4320455.

It is an arithmetic number, because the mean of its divisors is an integer number (43398828).

Almost surely, 2^2121223110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121223110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2777524992).

2121223110 is an abundant number, since it is smaller than the sum of its proper divisors (3433826874).

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

2121223110 is a wasteful number, since it uses less digits than its factorization.

2121223110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121223110 is about 46056.7379435409. The cubic root of 2121223110 is about 1284.8786614472.

Adding to 2121223110 its reverse (113221212), we get a palindrome (2234444322).

The spelling of 2121223110 in words is "two billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred ten".