100221122210021 has 4 divisors (see below), whose sum is σ = 100263073289100. Its totient is φ = 100179171130944.

The previous prime is 100221122209997. The next prime is 100221122210023. The reversal of 100221122210021 is 120012221122001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41026779196225 + 59194343013796 = 6405215^2 + 7693786^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221122210021 - 2³⁸ = 99946244303077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221122210023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20975535956 + ... + 20975540733.

It is an arithmetic number, because the mean of its divisors is an integer number (25065768322275).

Almost surely, 2^{100221122210021} is an apocalyptic number.

It is an amenable number.

100221122210021 is a deficient number, since it is larger than the sum of its proper divisors (41951079079).

100221122210021 is an equidigital number, since it uses as much as digits as its factorization.

100221122210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41951079078.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 100221122210021 its reverse (120012221122001), we get a palindrome (220233343332022).

The spelling of 100221122210021 in words is "one hundred trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred ten thousand, twenty-one".