21850863 has 8 divisors (see below), whose sum is σ = 29296176. Its totient is φ = 14486400.

The previous prime is 21850853. The next prime is 21850867. The reversal of 21850863 is 36805812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21850863 - 2⁶ = 21850799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850867) 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, 19578 + ... + 20663.

It is an arithmetic number, because the mean of its divisors is an integer number (3662022).

Almost surely, 2^21850863 is an apocalyptic number.

21850863 is a deficient number, since it is larger than the sum of its proper divisors (7445313).

21850863 is a wasteful number, since it uses less digits than its factorization.

21850863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40425.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 21850863 is about 4674.4906674417. The cubic root of 21850863 is about 279.5693336826.

The spelling of 21850863 in words is "twenty-one million, eight hundred fifty thousand, eight hundred sixty-three".