100220431021 has 2 divisors, whose sum is σ = 100220431022. Its totient is φ = 100220431020.

The previous prime is 100220431001. The next prime is 100220431033. The reversal of 100220431021 is 120134022001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89230053796 + 10990377225 = 298714^2 + 104835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100220431021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100220430986 and 100220431004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100220431001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110215510 + 50110215511.

It is an arithmetic number, because the mean of its divisors is an integer number (50110215511).

Almost surely, 2^100220431021 is an apocalyptic number.

It is an amenable number.

100220431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100220431021 is an equidigital number, since it uses as much as digits as its factorization.

100220431021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 100220431021 its reverse (120134022001), we get a palindrome (220354453022).

The spelling of 100220431021 in words is "one hundred billion, two hundred twenty million, four hundred thirty-one thousand, twenty-one".