21464255 has 16 divisors (see below), whose sum is σ = 26657760. Its totient is φ = 16578432.

The previous prime is 21464249. The next prime is 21464269. The reversal of 21464255 is 55246412.

It is a cyclic number.

It is not a de Polignac number, because 21464255 - 2⁴ = 21464239 is a prime.

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, 28676 + ... + 29414.

It is an arithmetic number, because the mean of its divisors is an integer number (1666110).

Almost surely, 2^21464255 is an apocalyptic number.

21464255 is a deficient number, since it is larger than the sum of its proper divisors (5193505).

21464255 is a wasteful number, since it uses less digits than its factorization.

21464255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

The product of its digits is 9600, while the sum is 29.

The square root of 21464255 is about 4632.9531618612. The cubic root of 21464255 is about 277.9107031661.

The spelling of 21464255 in words is "twenty-one million, four hundred sixty-four thousand, two hundred fifty-five".