100021122312121 has 4 divisors (see below), whose sum is σ = 100023237105012. Its totient is φ = 100019007519232.

The previous prime is 100021122312031. The next prime is 100021122312131. The reversal of 100021122312121 is 121213221120001.

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 18932628154896 + 81088494157225 = 4351164^2 + 9004915^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021122312121 - 2⁷ = 100021122311993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100021122312131) 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, 1057325500 + ... + 1057420093.

It is an arithmetic number, because the mean of its divisors is an integer number (25005809276253).

Almost surely, 2^{100021122312121} is an apocalyptic number.

It is an amenable number.

100021122312121 is a deficient number, since it is larger than the sum of its proper divisors (2114792891).

100021122312121 is an equidigital number, since it uses as much as digits as its factorization.

100021122312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114792890.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 100021122312121 its reverse (121213221120001), we get a palindrome (221234343432122).

The spelling of 100021122312121 in words is "one hundred trillion, twenty-one billion, one hundred twenty-two million, three hundred twelve thousand, one hundred twenty-one".