21850655 has 8 divisors (see below), whose sum is σ = 26339712. Its totient is φ = 17401248.

The previous prime is 21850637. The next prime is 21850679. The reversal of 21850655 is 55605812.

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

It is a cyclic number.

It is not a de Polignac number, because 21850655 - 2¹⁰ = 21849631 is a prime.

It is a super-2 number, since 2×21850655² = 954902247858050, which contains 22 as substring.

It is a Duffinian number.

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, 8684 + ... + 10913.

It is an arithmetic number, because the mean of its divisors is an integer number (3292464).

Almost surely, 2^21850655 is an apocalyptic number.

21850655 is a deficient number, since it is larger than the sum of its proper divisors (4489057).

21850655 is a wasteful number, since it uses less digits than its factorization.

21850655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19825.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 21850655 is about 4674.4684189756. The cubic root of 21850655 is about 279.5684465994.

The spelling of 21850655 in words is "twenty-one million, eight hundred fifty thousand, six hundred fifty-five".