100001222110021 has 2 divisors, whose sum is σ = 100001222110022. Its totient is φ = 100001222110020.

The previous prime is 100001222110019. The next prime is 100001222110057. The reversal of 100001222110021 is 120011222100001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96071950656900 + 3929271453121 = 9801630^2 + 1982239^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001222110021 - 2¹ = 100001222110019 is a prime.

Together with 100001222110019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 100001222109983 and 100001222110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001222110081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000611055010 + 50000611055011.

It is an arithmetic number, because the mean of its divisors is an integer number (50000611055011).

Almost surely, 2^{100001222110021} is an apocalyptic number.

It is an amenable number.

100001222110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001222110021 is an equidigital number, since it uses as much as digits as its factorization.

100001222110021 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 13.

Adding to 100001222110021 its reverse (120011222100001), we get a palindrome (220012444210022).

The spelling of 100001222110021 in words is "one hundred trillion, one billion, two hundred twenty-two million, one hundred ten thousand, twenty-one".