100001200121 has 4 divisors (see below), whose sum is σ = 105264421200. Its totient is φ = 94737979044.

The previous prime is 100001200109. The next prime is 100001200133. The reversal of 100001200121 is 121002100001.

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 an emirpimes, since its reverse is a distinct semiprime: 121002100001 = 19 ⋅6368531579.

It is an interprime number because it is at equal distance from previous prime (100001200109) and next prime (100001200133).

It is a cyclic number.

It is not a de Polignac number, because 100001200121 - 2¹⁰ = 100001199097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001200099 and 100001200108.

It is not an unprimeable number, because it can be changed into a prime (100001200181) 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, 2631610511 + ... + 2631610548.

It is an arithmetic number, because the mean of its divisors is an integer number (26316105300).

Almost surely, 2^100001200121 is an apocalyptic number.

It is an amenable number.

100001200121 is a deficient number, since it is larger than the sum of its proper divisors (5263221079).

100001200121 is an equidigital number, since it uses as much as digits as its factorization.

100001200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263221078.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100001200121 its reverse (121002100001), we get a palindrome (221003300122).

It can be divided in two parts, 10000 and 1200121, that added together give a palindrome (1210121).

The spelling of 100001200121 in words is "one hundred billion, one million, two hundred thousand, one hundred twenty-one".