100221001212121 has 4 divisors (see below), whose sum is σ = 100952541367092. Its totient is φ = 99489461057152.

The previous prime is 100221001212091. The next prime is 100221001212179. The reversal of 100221001212121 is 121212100122001.

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 31199150784400 + 69021850427721 = 5585620^2 + 8307939^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221001212121 - 2⁵ = 100221001212089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221001212095 and 100221001212104.

It is not an unprimeable number, because it can be changed into a prime (100221041212121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365770077280 + ... + 365770077553.

It is an arithmetic number, because the mean of its divisors is an integer number (25238135341773).

Almost surely, 2^{100221001212121} is an apocalyptic number.

It is an amenable number.

100221001212121 is a deficient number, since it is larger than the sum of its proper divisors (731540154971).

100221001212121 is an equidigital number, since it uses as much as digits as its factorization.

100221001212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731540154970.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 100221001212121 its reverse (121212100122001), we get a palindrome (221433101334122).

The spelling of 100221001212121 in words is "one hundred trillion, two hundred twenty-one billion, one million, two hundred twelve thousand, one hundred twenty-one".