1223421 has 4 divisors (see below), whose sum is σ = 1631232. Its totient is φ = 815612.

The previous prime is 1223419. The next prime is 1223437. The reversal of 1223421 is 1243221.

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 1223421 - 2¹ = 1223419 is a prime.

It is a D-number.

1223421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203901 + ... + 203906.

It is an arithmetic number, because the mean of its divisors is an integer number (407808).

2^1223421 is an apocalyptic number.

It is an amenable number.

1223421 is a deficient number, since it is larger than the sum of its proper divisors (407811).

1223421 is an equidigital number, since it uses as much as digits as its factorization.

1223421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407810.

The product of its digits is 96, while the sum is 15.

The square root of 1223421 is about 1106.0836315578. The cubic root of 1223421 is about 106.9527552220.

Adding to 1223421 its reverse (1243221), we get a palindrome (2466642).

The spelling of 1223421 in words is "one million, two hundred twenty-three thousand, four hundred twenty-one".