12221112210 has 64 divisors (see below), whose sum is σ = 30360932352. Its totient is φ = 3145879296.

The previous prime is 12221112209. The next prime is 12221112251. The reversal of 12221112210 is 1221112221.

It is a super-2 number, since 2×12221112210² (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 self number, because there is not a number n which added to its sum of digits gives 12221112210.

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, 97624 + ... + 184316.

It is an arithmetic number, because the mean of its divisors is an integer number (474389568).

Almost surely, 2^12221112210 is an apocalyptic number.

12221112210 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 12221112210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15180466176).

12221112210 is an abundant number, since it is smaller than the sum of its proper divisors (18139820142).

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

12221112210 is a wasteful number, since it uses less digits than its factorization.

12221112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86867.

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

Adding to 12221112210 its reverse (1221112221), we get a palindrome (13442224431).

It can be divided in two parts, 122211 and 12210, that added together give a triangular number (134421 = T₅₁₈).

The spelling of 12221112210 in words is "twelve billion, two hundred twenty-one million, one hundred twelve thousand, two hundred ten".