21948266 has 4 divisors (see below), whose sum is σ = 32922402. Its totient is φ = 10974132.

The previous prime is 21948263. The next prime is 21948293. The reversal of 21948266 is 66284912.

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., 21893041 + 55225 = 4679^2 + 235^2 .

It is not an unprimeable number, because it can be changed into a prime (21948263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5487065 + ... + 5487068.

Almost surely, 2^21948266 is an apocalyptic number.

21948266 is a deficient number, since it is larger than the sum of its proper divisors (10974136).

21948266 is a wasteful number, since it uses less digits than its factorization.

21948266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10974135.

The product of its digits is 41472, while the sum is 38.

The square root of 21948266 is about 4684.8976509631. The cubic root of 21948266 is about 279.9841232494.

The spelling of 21948266 in words is "twenty-one million, nine hundred forty-eight thousand, two hundred sixty-six".