21914338 has 4 divisors (see below), whose sum is σ = 32871510. Its totient is φ = 10957168.

The previous prime is 21914329. The next prime is 21914339. The reversal of 21914338 is 83341912.

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., 16024009 + 5890329 = 4003^2 + 2427^2 .

It is not an unprimeable number, because it can be changed into a prime (21914339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5478583 + ... + 5478586.

Almost surely, 2^21914338 is an apocalyptic number.

21914338 is a deficient number, since it is larger than the sum of its proper divisors (10957172).

21914338 is a wasteful number, since it uses less digits than its factorization.

21914338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10957171.

The product of its digits is 5184, while the sum is 31.

The square root of 21914338 is about 4681.2752536034. The cubic root of 21914338 is about 279.8397807872.

The spelling of 21914338 in words is "twenty-one million, nine hundred fourteen thousand, three hundred thirty-eight".