21008914 has 4 divisors (see below), whose sum is σ = 31513374. Its totient is φ = 10504456.

The previous prime is 21008903. The next prime is 21008941. The reversal of 21008914 is 41980012.

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., 11675889 + 9333025 = 3417^2 + 3055^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252227 + ... + 5252230.

Almost surely, 2^21008914 is an apocalyptic number.

21008914 is a deficient number, since it is larger than the sum of its proper divisors (10504460).

21008914 is a wasteful number, since it uses less digits than its factorization.

21008914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10504459.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21008914 is about 4583.5481889034. The cubic root of 21008914 is about 275.9314487035.

Adding to 21008914 its reverse (41980012), we get a palindrome (62988926).

The spelling of 21008914 in words is "twenty-one million, eight thousand, nine hundred fourteen".