21295255 has 8 divisors (see below), whose sum is σ = 25581600. Its totient is φ = 17018016.

The previous prime is 21295249. The next prime is 21295259. The reversal of 21295255 is 55259212.

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 21295255 - 2¹⁷ = 21164183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21295259) 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, 4981 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (3197700).

Almost surely, 2^21295255 is an apocalyptic number.

21295255 is a deficient number, since it is larger than the sum of its proper divisors (4286345).

21295255 is a wasteful number, since it uses less digits than its factorization.

21295255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553.

The product of its digits is 9000, while the sum is 31.

The square root of 21295255 is about 4614.6782119667. The cubic root of 21295255 is about 277.1793987037.

The spelling of 21295255 in words is "twenty-one million, two hundred ninety-five thousand, two hundred fifty-five".