100000020121 has 16 divisors (see below), whose sum is σ = 103244295168. Its totient is φ = 96797065600.

The previous prime is 100000020083. The next prime is 100000020137. The reversal of 100000020121 is 121020000001.

It is a cyclic number.

It is not a de Polignac number, because 100000020121 - 2²³ = 99991631513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100000020151) 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, 2708616 + ... + 2745286.

It is an arithmetic number, because the mean of its divisors is an integer number (6452768448).

Almost surely, 2^100000020121 is an apocalyptic number.

It is an amenable number.

100000020121 is a deficient number, since it is larger than the sum of its proper divisors (3244275047).

100000020121 is a wasteful number, since it uses less digits than its factorization.

100000020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37232.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 100000020121 its reverse (121020000001), we get a palindrome (221020020122).

The spelling of 100000020121 in words is "one hundred billion, twenty thousand, one hundred twenty-one".