21072814 has 8 divisors (see below), whose sum is σ = 36124848. Its totient is φ = 9031200.

The previous prime is 21072769. The next prime is 21072823. The reversal of 21072814 is 41827012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752587 + ... + 752614.

It is an arithmetic number, because the mean of its divisors is an integer number (4515606).

Almost surely, 2^21072814 is an apocalyptic number.

21072814 is a deficient number, since it is larger than the sum of its proper divisors (15052034).

21072814 is a wasteful number, since it uses less digits than its factorization.

21072814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505210.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21072814 is about 4590.5134789041. The cubic root of 21072814 is about 276.2109201285.

Adding to 21072814 its reverse (41827012), we get a palindrome (62899826).

The spelling of 21072814 in words is "twenty-one million, seventy-two thousand, eight hundred fourteen".