100020120121 has 4 divisors (see below), whose sum is σ = 100020895632. Its totient is φ = 100019344612.

The previous prime is 100020120113. The next prime is 100020120157. The reversal of 100020120121 is 121021020001.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 100020120121 - 2³ = 100020120113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100020120098 and 100020120107.

It is not an unprimeable number, because it can be changed into a prime (100020120521) 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, 142651 + ... + 469456.

It is an arithmetic number, because the mean of its divisors is an integer number (25005223908).

Almost surely, 2^100020120121 is an apocalyptic number.

It is an amenable number.

100020120121 is a deficient number, since it is larger than the sum of its proper divisors (775511).

100020120121 is an equidigital number, since it uses as much as digits as its factorization.

100020120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775510.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100020120121 its reverse (121021020001), we get a palindrome (221041140122).

The spelling of 100020120121 in words is "one hundred billion, twenty million, one hundred twenty thousand, one hundred twenty-one".