21549914 has 16 divisors (see below), whose sum is σ = 36028800. Its totient is φ = 9607104.

The previous prime is 21549911. The next prime is 21549949. The reversal of 21549914 is 41994512.

It is not an unprimeable number, because it can be changed into a prime (21549911) 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, 16034 + ... + 17325.

It is an arithmetic number, because the mean of its divisors is an integer number (2251800).

Almost surely, 2^21549914 is an apocalyptic number.

21549914 is a deficient number, since it is larger than the sum of its proper divisors (14478886).

21549914 is a wasteful number, since it uses less digits than its factorization.

21549914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33397.

The product of its digits is 12960, while the sum is 35.

The square root of 21549914 is about 4642.1884925108. The cubic root of 21549914 is about 278.2799054424.

The spelling of 21549914 in words is "twenty-one million, five hundred forty-nine thousand, nine hundred fourteen".