22221111210 has 64 divisors (see below), whose sum is σ = 55839829248. Its totient is φ = 5648597504.

The previous prime is 22221111191. The next prime is 22221111257. The reversal of 22221111210 is 1211112222.

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 22221111210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147214 + ... + 257126.

It is an arithmetic number, because the mean of its divisors is an integer number (872497332).

Almost surely, 2^22221111210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221111210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27919914624).

22221111210 is an abundant number, since it is smaller than the sum of its proper divisors (33618718038).

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

22221111210 is a wasteful number, since it uses less digits than its factorization.

22221111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110239.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22221111210 its reverse (1211112222), we get a palindrome (23432223432).

The spelling of 22221111210 in words is "twenty-two billion, two hundred twenty-one million, one hundred eleven thousand, two hundred ten".