100221031973 has 2 divisors, whose sum is σ = 100221031974. Its totient is φ = 100221031972.

The previous prime is 100221031927. The next prime is 100221031987. The reversal of 100221031973 is 379130122001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78928969249 + 21292062724 = 280943^2 + 145918^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221031973 - 2⁶ = 100221031909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100221031993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110515986 + 50110515987.

It is an arithmetic number, because the mean of its divisors is an integer number (50110515987).

Almost surely, 2^100221031973 is an apocalyptic number.

It is an amenable number.

100221031973 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221031973 is an equidigital number, since it uses as much as digits as its factorization.

100221031973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

Adding to 100221031973 its reverse (379130122001), we get a palindrome (479351153974).

The spelling of 100221031973 in words is "one hundred billion, two hundred twenty-one million, thirty-one thousand, nine hundred seventy-three".