21872246 has 8 divisors (see below), whose sum is σ = 35790984. Its totient is φ = 9941920.

The previous prime is 21872237. The next prime is 21872269. The reversal of 21872246 is 64227812.

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, 497075 + ... + 497118.

It is an arithmetic number, because the mean of its divisors is an integer number (4473873).

Almost surely, 2^21872246 is an apocalyptic number.

21872246 is a deficient number, since it is larger than the sum of its proper divisors (13918738).

21872246 is a wasteful number, since it uses less digits than its factorization.

21872246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994206.

The product of its digits is 10752, while the sum is 32.

The square root of 21872246 is about 4676.7773092163. Note that the first 3 decimals coincide. The cubic root of 21872246 is about 279.6604983826.

The spelling of 21872246 in words is "twenty-one million, eight hundred seventy-two thousand, two hundred forty-six".