2220100001221 has 2 divisors, whose sum is σ = 2220100001222. Its totient is φ = 2220100001220.

The previous prime is 2220100001213. The next prime is 2220100001227. The reversal of 2220100001221 is 1221000010222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2095586292996 + 124513708225 = 1447614^2 + 352865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220100001221 - 2³ = 2220100001213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2220100001227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110050000610 + 1110050000611.

It is an arithmetic number, because the mean of its divisors is an integer number (1110050000611).

Almost surely, 2^{2220100001221} is an apocalyptic number.

It is an amenable number.

2220100001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220100001221 is an equidigital number, since it uses as much as digits as its factorization.

2220100001221 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 13.

Adding to 2220100001221 its reverse (1221000010222), we get a palindrome (3441100011443).

Subtracting from 2220100001221 its reverse (1221000010222), we obtain a palindrome (999099990999).

The spelling of 2220100001221 in words is "two trillion, two hundred twenty billion, one hundred million, one thousand, two hundred twenty-one".