21850365 has 8 divisors (see below), whose sum is σ = 34960608. Its totient is φ = 11653520.

The previous prime is 21850357. The next prime is 21850393. The reversal of 21850365 is 56305812.

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

It is not a de Polignac number, because 21850365 - 2³ = 21850357 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728331 + ... + 728360.

It is an arithmetic number, because the mean of its divisors is an integer number (4370076).

Almost surely, 2^21850365 is an apocalyptic number.

It is an amenable number.

21850365 is a deficient number, since it is larger than the sum of its proper divisors (13110243).

21850365 is a wasteful number, since it uses less digits than its factorization.

21850365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456699.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 21850365 is about 4674.4373993027. The cubic root of 21850365 is about 279.5672097911.

The spelling of 21850365 in words is "twenty-one million, eight hundred fifty thousand, three hundred sixty-five".