21294618 has 16 divisors (see below), whose sum is σ = 42743136. Its totient is φ = 7072560.

The previous prime is 21294617. The next prime is 21294629. The reversal of 21294618 is 81649212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21294617) 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, 4573 + ... + 7968.

It is an arithmetic number, because the mean of its divisors is an integer number (2671446).

Almost surely, 2^21294618 is an apocalyptic number.

21294618 is an abundant number, since it is smaller than the sum of its proper divisors (21448518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21294618 is a wasteful number, since it uses less digits than its factorization.

21294618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12829.

The product of its digits is 6912, while the sum is 33.

The square root of 21294618 is about 4614.6091925536. The cubic root of 21294618 is about 277.1766349419.

It can be divided in two parts, 21294 and 618, that added together give a palindrome (21912).

The spelling of 21294618 in words is "twenty-one million, two hundred ninety-four thousand, six hundred eighteen".