221220222101 has 2 divisors, whose sum is σ = 221220222102. Its totient is φ = 221220222100.

The previous prime is 221220222089. The next prime is 221220222149. The reversal of 221220222101 is 101222022122.

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., 164921271025 + 56298951076 = 406105^2 + 237274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221220222101 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221220222101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220222161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610111050 + 110610111051.

It is an arithmetic number, because the mean of its divisors is an integer number (110610111051).

Almost surely, 2^221220222101 is an apocalyptic number.

It is an amenable number.

221220222101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220222101 is an equidigital number, since it uses as much as digits as its factorization.

221220222101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221220222101 its reverse (101222022122), we get a palindrome (322442244223).

The spelling of 221220222101 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred one".