12212341221 has 32 divisors (see below), whose sum is σ = 18231284736. Its totient is φ = 7234560000.

The previous prime is 12212341217. The next prime is 12212341223. The reversal of 12212341221 is 12214321221.

It is a happy number.

It is not a de Polignac number, because 12212341221 - 2² = 12212341217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212341223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29380 + ... + 159021.

It is an arithmetic number, because the mean of its divisors is an integer number (569727648).

Almost surely, 2^12212341221 is an apocalyptic number.

It is an amenable number.

12212341221 is a deficient number, since it is larger than the sum of its proper divisors (6018943515).

12212341221 is a wasteful number, since it uses less digits than its factorization.

12212341221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188493.

The product of its digits is 384, while the sum is 21.

Adding to 12212341221 its reverse (12214321221), we get a palindrome (24426662442).

The spelling of 12212341221 in words is "twelve billion, two hundred twelve million, three hundred forty-one thousand, two hundred twenty-one".