220100100221 has 2 divisors, whose sum is σ = 220100100222. Its totient is φ = 220100100220.

The previous prime is 220100100217. The next prime is 220100100229. The reversal of 220100100221 is 122001001022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219854080996 + 246019225 = 468886^2 + 15685^2 .

It is a cyclic number.

It is not a de Polignac number, because 220100100221 - 2² = 220100100217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220100100229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110050050110 + 110050050111.

It is an arithmetic number, because the mean of its divisors is an integer number (110050050111).

Almost surely, 2^220100100221 is an apocalyptic number.

It is an amenable number.

220100100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220100100221 is an equidigital number, since it uses as much as digits as its factorization.

220100100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 220100100221 its reverse (122001001022), we get a palindrome (342101101243).

The spelling of 220100100221 in words is "two hundred twenty billion, one hundred million, one hundred thousand, two hundred twenty-one".