100221221222021 has 2 divisors, whose sum is σ = 100221221222022. Its totient is φ = 100221221222020.

The previous prime is 100221221221987. The next prime is 100221221222027. The reversal of 100221221222021 is 120222122122001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83499132981796 + 16722088240225 = 9137786^2 + 4089265^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221221222021 - 2¹⁸ = 100221220959877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100221221221984 and 100221221222002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100221221222027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110610611010 + 50110610611011.

It is an arithmetic number, because the mean of its divisors is an integer number (50110610611011).

Almost surely, 2^{100221221222021} is an apocalyptic number.

It is an amenable number.

100221221222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221221222021 is an equidigital number, since it uses as much as digits as its factorization.

100221221222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 100221221222021 its reverse (120222122122001), we get a palindrome (220443343344022).

The spelling of 100221221222021 in words is "one hundred trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty-one".