1222621 has 4 divisors (see below), whose sum is σ = 1227744. Its totient is φ = 1217500.

The previous prime is 1222603. The next prime is 1222633. The reversal of 1222621 is 1262221.

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 1222621 - 2⁷ = 1222493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222595 and 1222604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222601) 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, 2185 + ... + 2686.

It is an arithmetic number, because the mean of its divisors is an integer number (306936).

2^1222621 is an apocalyptic number.

It is an amenable number.

1222621 is a deficient number, since it is larger than the sum of its proper divisors (5123).

1222621 is an equidigital number, since it uses as much as digits as its factorization.

1222621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122.

The product of its digits is 96, while the sum is 16.

The square root of 1222621 is about 1105.7219361123. The cubic root of 1222621 is about 106.9294378574.

Adding to 1222621 its reverse (1262221), we get a palindrome (2484842).

The spelling of 1222621 in words is "one million, two hundred twenty-two thousand, six hundred twenty-one".