21294255 has 8 divisors (see below), whose sum is σ = 34070832. Its totient is φ = 11356928.

The previous prime is 21294253. The next prime is 21294263. The reversal of 21294255 is 55249212.

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 21294255 - 2¹ = 21294253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294253) 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, 709794 + ... + 709823.

It is an arithmetic number, because the mean of its divisors is an integer number (4258854).

Almost surely, 2^21294255 is an apocalyptic number.

21294255 is a deficient number, since it is larger than the sum of its proper divisors (12776577).

21294255 is a wasteful number, since it uses less digits than its factorization.

21294255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419625.

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

The square root of 21294255 is about 4614.5698607779. The cubic root of 21294255 is about 277.1750599635.

The spelling of 21294255 in words is "twenty-one million, two hundred ninety-four thousand, two hundred fifty-five".