21246255 has 12 divisors (see below), whose sum is σ = 36826920. Its totient is φ = 11331312.

The previous prime is 21246229. The next prime is 21246263. The reversal of 21246255 is 55264212.

It is not a de Polignac number, because 21246255 - 2¹⁵ = 21213487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236025 + ... + 236114.

It is an arithmetic number, because the mean of its divisors is an integer number (3068910).

Almost surely, 2^21246255 is an apocalyptic number.

21246255 is a deficient number, since it is larger than the sum of its proper divisors (15580665).

21246255 is a wasteful number, since it uses less digits than its factorization.

21246255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472150 (or 472147 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 21246255 is about 4609.3660084658. The cubic root of 21246255 is about 276.9666404934.

The spelling of 21246255 in words is "twenty-one million, two hundred forty-six thousand, two hundred fifty-five".