21289322 has 4 divisors (see below), whose sum is σ = 31933986. Its totient is φ = 10644660.

The previous prime is 21289297. The next prime is 21289337. The reversal of 21289322 is 22398212.

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., 13830961 + 7458361 = 3719^2 + 2731^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5322329 + ... + 5322332.

Almost surely, 2^21289322 is an apocalyptic number.

21289322 is a deficient number, since it is larger than the sum of its proper divisors (10644664).

21289322 is a wasteful number, since it uses less digits than its factorization.

21289322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10644663.

The product of its digits is 3456, while the sum is 29.

The square root of 21289322 is about 4614.0353271296. The cubic root of 21289322 is about 277.1536549700.

The spelling of 21289322 in words is "twenty-one million, two hundred eighty-nine thousand, three hundred twenty-two".