12100421 has 4 divisors (see below), whose sum is σ = 12145344. Its totient is φ = 12055500.

The previous prime is 12100411. The next prime is 12100441. The reversal of 12100421 is 12400121.

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 not a de Polignac number, because 12100421 - 2²² = 7906117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22055 + ... + 22596.

It is an arithmetic number, because the mean of its divisors is an integer number (3036336).

Almost surely, 2^12100421 is an apocalyptic number.

It is an amenable number.

12100421 is a deficient number, since it is larger than the sum of its proper divisors (44923).

12100421 is an equidigital number, since it uses as much as digits as its factorization.

12100421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44922.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12100421 is about 3478.5659401541. The cubic root of 12100421 is about 229.5797050234.

Adding to 12100421 its reverse (12400121), we get a palindrome (24500542).

It can be divided in two parts, 12100 and 421, that added together give a palindrome (12521).

The spelling of 12100421 in words is "twelve million, one hundred thousand, four hundred twenty-one".