21625814 has 16 divisors (see below), whose sum is σ = 37367808. Its totient is φ = 9194472.

The previous prime is 21625811. The next prime is 21625823. The reversal of 21625814 is 41852612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4304 + ... + 7859.

It is an arithmetic number, because the mean of its divisors is an integer number (2335488).

Almost surely, 2^21625814 is an apocalyptic number.

21625814 is a deficient number, since it is larger than the sum of its proper divisors (15741994).

21625814 is a wasteful number, since it uses less digits than its factorization.

21625814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12299.

The product of its digits is 3840, while the sum is 29.

The square root of 21625814 is about 4650.3563304332. The cubic root of 21625814 is about 278.6062284192.

The spelling of 21625814 in words is "twenty-one million, six hundred twenty-five thousand, eight hundred fourteen".