100120010121 has 16 divisors (see below), whose sum is σ = 148345372800. Its totient is φ = 66737929104.

The previous prime is 100120010119. The next prime is 100120010131. The reversal of 100120010121 is 121010021001.

It is a happy number.

It is not a de Polignac number, because 100120010121 - 2¹ = 100120010119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (100120010131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29581 + ... + 448458.

It is an arithmetic number, because the mean of its divisors is an integer number (9271585800).

Almost surely, 2^100120010121 is an apocalyptic number.

It is an amenable number.

100120010121 is a deficient number, since it is larger than the sum of its proper divisors (48225362679).

100120010121 is an equidigital number, since it uses as much as digits as its factorization.

100120010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485805 (or 485799 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 100120010121 its reverse (121010021001), we get a palindrome (221130031122).

The spelling of 100120010121 in words is "one hundred billion, one hundred twenty million, ten thousand, one hundred twenty-one".