21642814 has 16 divisors (see below), whose sum is σ = 32926608. Its totient is φ = 10668672.

The previous prime is 21642799. The next prime is 21642833. The reversal of 21642814 is 41824612.

It is a super-2 number, since 2×21642814² = 936822795677192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64054 + ... + 64390.

It is an arithmetic number, because the mean of its divisors is an integer number (2057913).

Almost surely, 2^21642814 is an apocalyptic number.

21642814 is a deficient number, since it is larger than the sum of its proper divisors (11283794).

21642814 is a wasteful number, since it uses less digits than its factorization.

21642814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699.

The product of its digits is 3072, while the sum is 28.

The square root of 21642814 is about 4652.1837882870. The cubic root of 21642814 is about 278.6792131919.

The spelling of 21642814 in words is "twenty-one million, six hundred forty-two thousand, eight hundred fourteen".