21799255 has 8 divisors (see below), whose sum is σ = 26188272. Its totient is φ = 17419968.

The previous prime is 21799243. The next prime is 21799279. The reversal of 21799255 is 55299712.

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 21799255 - 2¹¹ = 21797207 is a prime.

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, 4099 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (3273534).

Almost surely, 2^21799255 is an apocalyptic number.

21799255 is a deficient number, since it is larger than the sum of its proper divisors (4389017).

21799255 is a wasteful number, since it uses less digits than its factorization.

21799255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4865.

The product of its digits is 56700, while the sum is 40.

The square root of 21799255 is about 4668.9672305554. The cubic root of 21799255 is about 279.3490618649.

The spelling of 21799255 in words is "twenty-one million, seven hundred ninety-nine thousand, two hundred fifty-five".