12201421 has 4 divisors (see below), whose sum is σ = 12373344. Its totient is φ = 12029500.

The previous prime is 12201419. The next prime is 12201457. The reversal of 12201421 is 12410221.

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 not a de Polignac number, because 12201421 - 2¹ = 12201419 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 (12201491) 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, 85855 + ... + 85996.

It is an arithmetic number, because the mean of its divisors is an integer number (3093336).

Almost surely, 2^12201421 is an apocalyptic number.

It is an amenable number.

12201421 is a deficient number, since it is larger than the sum of its proper divisors (171923).

12201421 is an equidigital number, since it uses as much as digits as its factorization.

12201421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171922.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12201421 is about 3493.0532489500. The cubic root of 12201421 is about 230.2166892967.

Adding to 12201421 its reverse (12410221), we get a palindrome (24611642).

The spelling of 12201421 in words is "twelve million, two hundred one thousand, four hundred twenty-one".