12211111221210 has 96 divisors (see below), whose sum is σ = 34635914471808. Its totient is φ = 2960204204160.

The previous prime is 12211111221167. The next prime is 12211111221217. The reversal of 12211111221210 is 1212211111221.

It is a happy number.

12211111221210 is a `hidden beast` number, since 1 + 221 + 1 + 1 + 11 + 221 + 210 = 666.

It is a super-2 number, since 2×12211111221210² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12211111221217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56969499 + ... + 57183441.

It is an arithmetic number, because the mean of its divisors is an integer number (360790775748).

Almost surely, 2^{12211111221210} is an apocalyptic number.

12211111221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12211111221210 is an abundant number, since it is smaller than the sum of its proper divisors (22424803250598).

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

12211111221210 is a wasteful number, since it uses less digits than its factorization.

12211111221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271620 (or 271617 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12211111221210 its reverse (1212211111221), we get a palindrome (13423322332431).

The spelling of 12211111221210 in words is "twelve trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, two hundred ten".