22111221210 has 64 divisors (see below), whose sum is σ = 57176437248. Its totient is φ = 5440149504.

The previous prime is 22111221161. The next prime is 22111221217. The reversal of 22111221210 is 1212211122.

It is a super-2 number, since 2×22111221210² (a number of 21 digits) contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22111221210.

It is not an unprimeable number, because it can be changed into a prime (22111221217) 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, 873999 + ... + 898941.

It is an arithmetic number, because the mean of its divisors is an integer number (893381832).

Almost surely, 2^22111221210 is an apocalyptic number.

22111221210 is an abundant number, since it is smaller than the sum of its proper divisors (35065216038).

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

22111221210 is a wasteful number, since it uses less digits than its factorization.

22111221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27239.

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

Adding to 22111221210 its reverse (1212211122), we get a palindrome (23323432332).

The spelling of 22111221210 in words is "twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred ten".