21400814 has 4 divisors (see below), whose sum is σ = 32101224. Its totient is φ = 10700406.

The previous prime is 21400801. The next prime is 21400823. The reversal of 21400814 is 41800412.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350202 + ... + 5350205.

It is an arithmetic number, because the mean of its divisors is an integer number (8025306).

Almost surely, 2^21400814 is an apocalyptic number.

21400814 is a deficient number, since it is larger than the sum of its proper divisors (10700410).

21400814 is a wasteful number, since it uses less digits than its factorization.

21400814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700409.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21400814 is about 4626.1013823737. The cubic root of 21400814 is about 277.6366299556.

The spelling of 21400814 in words is "twenty-one million, four hundred thousand, eight hundred fourteen".