100121020221 has 4 divisors (see below), whose sum is σ = 133494693632. Its totient is φ = 66747346812.

The previous prime is 100121020157. The next prime is 100121020267. The reversal of 100121020221 is 122020121001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100121020221 - 2⁶ = 100121020157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121020197 and 100121020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121020291) 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, 16686836701 + ... + 16686836706.

It is an arithmetic number, because the mean of its divisors is an integer number (33373673408).

Almost surely, 2^100121020221 is an apocalyptic number.

It is an amenable number.

100121020221 is a deficient number, since it is larger than the sum of its proper divisors (33373673411).

100121020221 is an equidigital number, since it uses as much as digits as its factorization.

100121020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33373673410.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 100121020221 its reverse (122020121001), we get a palindrome (222141141222).

The spelling of 100121020221 in words is "one hundred billion, one hundred twenty-one million, twenty thousand, two hundred twenty-one".