21260746 has 8 divisors (see below), whose sum is σ = 34344324. Its totient is φ = 9812640.

The previous prime is 21260711. The next prime is 21260749. The reversal of 21260746 is 64706212.

It can be written as a sum of positive squares in 2 ways, for example, as 19847025 + 1413721 = 4455^2 + 1189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21260749) 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 3 ways as a sum of consecutive naturals, for example, 408835 + ... + 408886.

Almost surely, 2^21260746 is an apocalyptic number.

21260746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21260746 is a deficient number, since it is larger than the sum of its proper divisors (13083578).

21260746 is a wasteful number, since it uses less digits than its factorization.

21260746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817736.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21260746 is about 4610.9376486784. The cubic root of 21260746 is about 277.0295945130.

Adding to 21260746 its reverse (64706212), we get a palindrome (85966958).

The spelling of 21260746 in words is "twenty-one million, two hundred sixty thousand, seven hundred forty-six".