100010120121 has 20 divisors (see below), whose sum is σ = 152872207312. Its totient is φ = 65122866648.

The previous prime is 100010120081. The next prime is 100010120129. The reversal of 100010120121 is 121021010001.

It is a happy number.

It is not a de Polignac number, because 100010120121 - 2⁹ = 100010119609 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100010120129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14353411 + ... + 14360376.

Almost surely, 2^100010120121 is an apocalyptic number.

It is an amenable number.

100010120121 is a deficient number, since it is larger than the sum of its proper divisors (52862087191).

100010120121 is an equidigital number, since it uses as much as digits as its factorization.

100010120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28713842 (or 28713833 counting only the distinct ones).

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

Adding to 100010120121 its reverse (121021010001), we get a palindrome (221031130122).

The spelling of 100010120121 in words is "one hundred billion, ten million, one hundred twenty thousand, one hundred twenty-one".