21873206 has 8 divisors (see below), whose sum is σ = 33429024. Its totient is φ = 10730200.

The previous prime is 21873191. The next prime is 21873217. The reversal of 21873206 is 60237812.

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, 103070 + ... + 103281.

It is an arithmetic number, because the mean of its divisors is an integer number (4178628).

Almost surely, 2^21873206 is an apocalyptic number.

21873206 is a deficient number, since it is larger than the sum of its proper divisors (11555818).

21873206 is a wasteful number, since it uses less digits than its factorization.

21873206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206406.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21873206 is about 4676.8799428679. The cubic root of 21873206 is about 279.6645898715.

The spelling of 21873206 in words is "twenty-one million, eight hundred seventy-three thousand, two hundred six".