21225814 has 4 divisors (see below), whose sum is σ = 31838724. Its totient is φ = 10612906.

The previous prime is 21225797. The next prime is 21225817. The reversal of 21225814 is 41852212.

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 (21225817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5306452 + ... + 5306455.

It is an arithmetic number, because the mean of its divisors is an integer number (7959681).

Almost surely, 2^21225814 is an apocalyptic number.

21225814 is a deficient number, since it is larger than the sum of its proper divisors (10612910).

21225814 is a wasteful number, since it uses less digits than its factorization.

21225814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10612909.

The product of its digits is 1280, while the sum is 25.

The square root of 21225814 is about 4607.1481417467. The cubic root of 21225814 is about 276.8777888863.

The spelling of 21225814 in words is "twenty-one million, two hundred twenty-five thousand, eight hundred fourteen".