21732814 has 4 divisors (see below), whose sum is σ = 32599224. Its totient is φ = 10866406.

The previous prime is 21732811. The next prime is 21732833. The reversal of 21732814 is 41823712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5433202 + ... + 5433205.

It is an arithmetic number, because the mean of its divisors is an integer number (8149806).

Almost surely, 2^21732814 is an apocalyptic number.

21732814 is a deficient number, since it is larger than the sum of its proper divisors (10866410).

21732814 is a wasteful number, since it uses less digits than its factorization.

21732814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10866409.

The product of its digits is 2688, while the sum is 28.

The square root of 21732814 is about 4661.8466298239. The cubic root of 21732814 is about 279.0649677630.

The spelling of 21732814 in words is "twenty-one million, seven hundred thirty-two thousand, eight hundred fourteen".