21613322 has 4 divisors (see below), whose sum is σ = 32419986. Its totient is φ = 10806660.

The previous prime is 21613321. The next prime is 21613327. The reversal of 21613322 is 22331612.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 21613201 + 121 = 4649^2 + 11^2 .

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21613294 and 21613303.

It is not an unprimeable number, because it can be changed into a prime (21613321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403329 + ... + 5403332.

Almost surely, 2^21613322 is an apocalyptic number.

21613322 is a deficient number, since it is larger than the sum of its proper divisors (10806664).

21613322 is a wasteful number, since it uses less digits than its factorization.

21613322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10806663.

The product of its digits is 432, while the sum is 20.

The square root of 21613322 is about 4649.0130135331. The cubic root of 21613322 is about 278.5525731078.

Adding to 21613322 its reverse (22331612), we get a palindrome (43944934).

The spelling of 21613322 in words is "twenty-one million, six hundred thirteen thousand, three hundred twenty-two".