2223621 has 6 divisors (see below), whose sum is σ = 3211910. Its totient is φ = 1482408.

The previous prime is 2223607. The next prime is 2223623. The reversal of 2223621 is 1263222.

2223621 is a `hidden beast` number, since 22 + 23 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1726596 + 497025 = 1314^2 + 705^2 .

It is not a de Polignac number, because 2223621 - 2⁷ = 2223493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2223594 and 2223603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2223623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123526 + ... + 123543.

2^2223621 is an apocalyptic number.

It is an amenable number.

2223621 is a deficient number, since it is larger than the sum of its proper divisors (988289).

2223621 is a wasteful number, since it uses less digits than its factorization.

2223621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247075 (or 247072 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 2223621 is about 1491.1810755237. The cubic root of 2223621 is about 130.5229624455.

Adding to 2223621 its reverse (1263222), we get a palindrome (3486843).

The spelling of 2223621 in words is "two million, two hundred twenty-three thousand, six hundred twenty-one".