12212211221221 has 8 divisors (see below), whose sum is σ = 13322437805088. Its totient is φ = 11101988898000.

The previous prime is 12212211221207. The next prime is 12212211221227.

12212211221221 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12212211221221 - 2⁹ = 12212211220709 is a prime.

It is a super-2 number, since 2×12212211221221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212211221192 and 12212211221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212211221227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9389391 + ... + 10610611.

It is an arithmetic number, because the mean of its divisors is an integer number (1665304725636).

Almost surely, 2^{12212211221221} is an apocalyptic number.

12212211221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212211221221 is a deficient number, since it is larger than the sum of its proper divisors (1110226583867).

12212211221221 is a wasteful number, since it uses less digits than its factorization.

12212211221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130323.

The product of its digits is 256, while the sum is 22.

Multiplying 12212211221221 by its sum of digits (22), we get a palindrome (268668646866862).

It can be divided in two parts, 1221221 and 1221221, that added together give a palindrome (2442442).

The spelling of 12212211221221 in words is "twelve trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".