12213121110 has 32 divisors (see below), whose sum is σ = 29314414080. Its totient is φ = 3256507488.

The previous prime is 12213121099. The next prime is 12213121111. The reversal of 12213121110 is 1112131221.

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 12213121110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213121111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530499 + ... + 553041.

It is an arithmetic number, because the mean of its divisors is an integer number (916075440).

Almost surely, 2^12213121110 is an apocalyptic number.

12213121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12213121110 is an abundant number, since it is smaller than the sum of its proper divisors (17101292970).

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

12213121110 is a wasteful number, since it uses less digits than its factorization.

12213121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40612.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12213121110 its reverse (1112131221), we get a palindrome (13325252331).

It can be divided in two parts, 122131211 and 10, that added together give a palindrome (122131221).

The spelling of 12213121110 in words is "twelve billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred ten".