21034266 has 16 divisors (see below), whose sum is σ = 45893088. Its totient is φ = 6374000.

The previous prime is 21034261. The next prime is 21034297. The reversal of 21034266 is 66243012.

It is not an unprimeable number, because it can be changed into a prime (21034261) 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, 159285 + ... + 159416.

It is an arithmetic number, because the mean of its divisors is an integer number (2868318).

Almost surely, 2^21034266 is an apocalyptic number.

21034266 is an abundant number, since it is smaller than the sum of its proper divisors (24858822).

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

21034266 is a wasteful number, since it uses less digits than its factorization.

21034266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318717.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21034266 is about 4586.3128981787. The cubic root of 21034266 is about 276.0423952938.

Adding to 21034266 its reverse (66243012), we get a palindrome (87277278).

The spelling of 21034266 in words is "twenty-one million, thirty-four thousand, two hundred sixty-six".