22215321 has 12 divisors (see below), whose sum is σ = 32694948. Its totient is φ = 14530464.

The previous prime is 22215301. The next prime is 22215341. The reversal of 22215321 is 12351222.

It is an interprime number because it is at equal distance from previous prime (22215301) and next prime (22215341).

It can be written as a sum of positive squares in 2 ways, for example, as 5934096 + 16281225 = 2436^2 + 4035^2 .

It is not a de Polignac number, because 22215321 - 2⁹ = 22214809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22215294 and 22215303.

It is not an unprimeable number, because it can be changed into a prime (22215301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22810 + ... + 23763.

It is an arithmetic number, because the mean of its divisors is an integer number (2724579).

Almost surely, 2^22215321 is an apocalyptic number.

It is an amenable number.

22215321 is a deficient number, since it is larger than the sum of its proper divisors (10479627).

22215321 is a wasteful number, since it uses less digits than its factorization.

22215321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46632 (or 46629 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 22215321 is about 4713.3131659163. The cubic root of 22215321 is about 281.1151151727.

Adding to 22215321 its reverse (12351222), we get a palindrome (34566543).

The spelling of 22215321 in words is "twenty-two million, two hundred fifteen thousand, three hundred twenty-one".