21235266 has 24 divisors (see below), whose sum is σ = 49549500. Its totient is φ = 6533856.

The previous prime is 21235243. The next prime is 21235273. The reversal of 21235266 is 66253212.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 29241 = 4605^2 + 171^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45141 + ... + 45608.

Almost surely, 2^21235266 is an apocalyptic number.

21235266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21235266 is an abundant number, since it is smaller than the sum of its proper divisors (28314234).

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

21235266 is a wasteful number, since it uses less digits than its factorization.

21235266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90770 (or 90767 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 21235266 is about 4608.1738248465. The cubic root of 21235266 is about 276.9188813111.

Adding to 21235266 its reverse (66253212), we get a palindrome (87488478).

The spelling of 21235266 in words is "twenty-one million, two hundred thirty-five thousand, two hundred sixty-six".