21827255 has 16 divisors (see below), whose sum is σ = 27558144. Its totient is φ = 16573440.

The previous prime is 21827249. The next prime is 21827261. The reversal of 21827255 is 55272812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21827249) and next prime (21827261).

It is not a de Polignac number, because 21827255 - 2⁶ = 21827191 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 15 ways as a sum of consecutive naturals, for example, 6887 + ... + 9543.

It is an arithmetic number, because the mean of its divisors is an integer number (1722384).

Almost surely, 2^21827255 is an apocalyptic number.

21827255 is a deficient number, since it is larger than the sum of its proper divisors (5730889).

21827255 is a wasteful number, since it uses less digits than its factorization.

21827255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746.

The product of its digits is 11200, while the sum is 32.

The square root of 21827255 is about 4671.9647901070. The cubic root of 21827255 is about 279.4686137676.

The spelling of 21827255 in words is "twenty-one million, eight hundred twenty-seven thousand, two hundred fifty-five".