22315621 has 4 divisors (see below), whose sum is σ = 22328812. Its totient is φ = 22302432.

The previous prime is 22315549. The next prime is 22315637. The reversal of 22315621 is 12651322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10660225 + 11655396 = 3265^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 22315621 - 2⁷ = 22315493 is a prime.

It is a super-3 number, since 3×22315621³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22315592 and 22315601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22315651) 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, 3606 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (5582203).

Almost surely, 2^22315621 is an apocalyptic number.

It is an amenable number.

22315621 is a deficient number, since it is larger than the sum of its proper divisors (13191).

22315621 is a wasteful number, since it uses less digits than its factorization.

22315621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13190.

The product of its digits is 720, while the sum is 22.

The square root of 22315621 is about 4723.9412570437. The cubic root of 22315621 is about 281.5375491368.

Adding to 22315621 its reverse (12651322), we get a palindrome (34966943).

The spelling of 22315621 in words is "twenty-two million, three hundred fifteen thousand, six hundred twenty-one".