100001222021 has 2 divisors, whose sum is σ = 100001222022. Its totient is φ = 100001222020.

The previous prime is 100001221997. The next prime is 100001222023. The reversal of 100001222021 is 120222100001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97397671396 + 2603550625 = 312086^2 + 51025^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001222021 - 2²⁶ = 99934113157 is a prime.

It is a Sophie Germain prime.

Together with 100001222023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100001221993 and 100001222011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001222023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000611010 + 50000611011.

It is an arithmetic number, because the mean of its divisors is an integer number (50000611011).

Almost surely, 2^100001222021 is an apocalyptic number.

It is an amenable number.

100001222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001222021 is an equidigital number, since it uses as much as digits as its factorization.

100001222021 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 100001222021 its reverse (120222100001), we get a palindrome (220223322022).

The spelling of 100001222021 in words is "one hundred billion, one million, two hundred twenty-two thousand, twenty-one".