21294286 has 16 divisors (see below), whose sum is σ = 34501824. Its totient is φ = 9798624.

The previous prime is 21294283. The next prime is 21294289. The reversal of 21294286 is 68249212.

It is an interprime number because it is at equal distance from previous prime (21294283) and next prime (21294289).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9291 + ... + 11353.

It is an arithmetic number, because the mean of its divisors is an integer number (2156364).

Almost surely, 2^21294286 is an apocalyptic number.

21294286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21294286 is a deficient number, since it is larger than the sum of its proper divisors (13207538).

21294286 is a wasteful number, since it uses less digits than its factorization.

21294286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475.

The product of its digits is 13824, while the sum is 34.

The square root of 21294286 is about 4614.5732197030. The cubic root of 21294286 is about 277.1751944665.

The spelling of 21294286 in words is "twenty-one million, two hundred ninety-four thousand, two hundred eighty-six".