100221220061 has 2 divisors, whose sum is σ = 100221220062. Its totient is φ = 100221220060.

The previous prime is 100221220037. The next prime is 100221220067. The reversal of 100221220061 is 160022122001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86314914436 + 13906305625 = 293794^2 + 117925^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221220061 - 2⁶ = 100221219997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100221220067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110610030 + 50110610031.

It is an arithmetic number, because the mean of its divisors is an integer number (50110610031).

Almost surely, 2^100221220061 is an apocalyptic number.

It is an amenable number.

100221220061 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221220061 is an equidigital number, since it uses as much as digits as its factorization.

100221220061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 100221220061 its reverse (160022122001), we get a palindrome (260243342062).

The spelling of 100221220061 in words is "one hundred billion, two hundred twenty-one million, two hundred twenty thousand, sixty-one".