21903914 has 4 divisors (see below), whose sum is σ = 32855874. Its totient is φ = 10951956.

The previous prime is 21903913. The next prime is 21903919. The reversal of 21903914 is 41930912.

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., 20403289 + 1500625 = 4517^2 + 1225^2 .

It is not an unprimeable number, because it can be changed into a prime (21903913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5475977 + ... + 5475980.

Almost surely, 2^21903914 is an apocalyptic number.

21903914 is a deficient number, since it is larger than the sum of its proper divisors (10951960).

21903914 is a wasteful number, since it uses less digits than its factorization.

21903914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10951959.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21903914 is about 4680.1617493416. The cubic root of 21903914 is about 279.7954032581.

The spelling of 21903914 in words is "twenty-one million, nine hundred three thousand, nine hundred fourteen".