12212112101221 has 4 divisors (see below), whose sum is σ = 12442529310732. Its totient is φ = 11981694891712.

The previous prime is 12212112101177. The next prime is 12212112101251. The reversal of 12212112101221 is 12210121121221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9998964948996 + 2213147152225 = 3162114^2 + 1487665^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212112101221 - 2⁷ = 12212112101093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212112101251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115208604676 + ... + 115208604781.

It is an arithmetic number, because the mean of its divisors is an integer number (3110632327683).

Almost surely, 2^{12212112101221} is an apocalyptic number.

It is an amenable number.

12212112101221 is a deficient number, since it is larger than the sum of its proper divisors (230417209511).

12212112101221 is an equidigital number, since it uses as much as digits as its factorization.

12212112101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230417209510.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12212112101221 its reverse (12210121121221), we get a palindrome (24422233222442).

The spelling of 12212112101221 in words is "twelve trillion, two hundred twelve billion, one hundred twelve million, one hundred one thousand, two hundred twenty-one".