21438914 has 16 divisors (see below), whose sum is σ = 36904896. Its totient is φ = 9150000.

The previous prime is 21438913. The next prime is 21438931. The reversal of 21438914 is 41983412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21438913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (2306556).

Almost surely, 2^21438914 is an apocalyptic number.

21438914 is a deficient number, since it is larger than the sum of its proper divisors (15465982).

21438914 is a wasteful number, since it uses less digits than its factorization.

21438914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6361.

The product of its digits is 6912, while the sum is 32.

The square root of 21438914 is about 4630.2174894923. The cubic root of 21438914 is about 277.8012916747.

The spelling of 21438914 in words is "twenty-one million, four hundred thirty-eight thousand, nine hundred fourteen".