1222421 has 4 divisors (see below), whose sum is σ = 1243200. Its totient is φ = 1201644.

The previous prime is 1222411. The next prime is 1222433. The reversal of 1222421 is 1242221.

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-1222421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222396 and 1222405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222411) 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, 10301 + ... + 10418.

It is an arithmetic number, because the mean of its divisors is an integer number (310800).

2^1222421 is an apocalyptic number.

It is an amenable number.

1222421 is a deficient number, since it is larger than the sum of its proper divisors (20779).

1222421 is an equidigital number, since it uses as much as digits as its factorization.

1222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20778.

The product of its digits is 64, while the sum is 14.

The square root of 1222421 is about 1105.6314937627. The cubic root of 1222421 is about 106.9236069270.

Adding to 1222421 its reverse (1242221), we get a palindrome (2464642).

The spelling of 1222421 in words is "one million, two hundred twenty-two thousand, four hundred twenty-one".