12100001 has 4 divisors (see below), whose sum is σ = 12626112. Its totient is φ = 11573892.

The previous prime is 12099991. The next prime is 12100003. The reversal of 12100001 is 10000121.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12100003) 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, 263021 + ... + 263066.

It is an arithmetic number, because the mean of its divisors is an integer number (3156528).

Almost surely, 2^12100001 is an apocalyptic number.

It is an amenable number.

12100001 is a deficient number, since it is larger than the sum of its proper divisors (526111).

12100001 is an equidigital number, since it uses as much as digits as its factorization.

12100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526110.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 12100001 is about 3478.5055699251. The cubic root of 12100001 is about 229.5770487910.

Adding to 12100001 its reverse (10000121), we get a palindrome (22100122).

Multiplying 12100001 by its reverse (10000121), we get a palindrome (121001474100121).

The spelling of 12100001 in words is "twelve million, one hundred thousand, one".