21253466 has 16 divisors (see below), whose sum is σ = 35262024. Its totient is φ = 9543744.

The previous prime is 21253459. The next prime is 21253469. The reversal of 21253466 is 66435212.

It can be written as a sum of positive squares in 4 ways, for example, as 20967241 + 286225 = 4579^2 + 535^2 .

It is not an unprimeable number, because it can be changed into a prime (21253469) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10085 + ... + 12008.

Almost surely, 2^21253466 is an apocalyptic number.

21253466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21253466 is a deficient number, since it is larger than the sum of its proper divisors (14008558).

21253466 is a wasteful number, since it uses less digits than its factorization.

21253466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22145.

The product of its digits is 8640, while the sum is 29.

The square root of 21253466 is about 4610.1481538016. The cubic root of 21253466 is about 276.9979711998.

Adding to 21253466 its reverse (66435212), we get a palindrome (87688678).

The spelling of 21253466 in words is "twenty-one million, two hundred fifty-three thousand, four hundred sixty-six".