21973338 has 24 divisors (see below), whose sum is σ = 48897108. Its totient is φ = 7126272.

The previous prime is 21973331. The next prime is 21973351. The reversal of 21973338 is 83337912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21930489 + 42849 = 4683^2 + 207^2 .

It is not an unprimeable number, because it can be changed into a prime (21973331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15831 + ... + 17162.

Almost surely, 2^21973338 is an apocalyptic number.

21973338 is an abundant number, since it is smaller than the sum of its proper divisors (26923770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21973338 is a wasteful number, since it uses less digits than its factorization.

21973338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33038 (or 33035 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 21973338 is about 4687.5727194359. The cubic root of 21973338 is about 280.0906934099.

The spelling of 21973338 in words is "twenty-one million, nine hundred seventy-three thousand, three hundred thirty-eight".