12220101221 has 2 divisors, whose sum is σ = 12220101222. Its totient is φ = 12220101220.

The previous prime is 12220101217. The next prime is 12220101233. The reversal of 12220101221 is 12210102221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8796564100 + 3423537121 = 93790^2 + 58511^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220101221 - 2² = 12220101217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12220101196 and 12220101205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220151221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110050610 + 6110050611.

It is an arithmetic number, because the mean of its divisors is an integer number (6110050611).

Almost surely, 2^12220101221 is an apocalyptic number.

It is an amenable number.

12220101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220101221 is an equidigital number, since it uses as much as digits as its factorization.

12220101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12220101221 its reverse (12210102221), we get a palindrome (24430203442).

The spelling of 12220101221 in words is "twelve billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".