21260650 has 24 divisors (see below), whose sum is σ = 40220640. Its totient is φ = 8358960.

The previous prime is 21260647. The next prime is 21260651. The reversal of 21260650 is 5606212.

It is a super-3 number, since 3×21260650³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21260651) 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 11 ways as a sum of consecutive naturals, for example, 654 + ... + 6553.

It is an arithmetic number, because the mean of its divisors is an integer number (1675860).

Almost surely, 2^21260650 is an apocalyptic number.

21260650 is a deficient number, since it is larger than the sum of its proper divisors (18959990).

21260650 is a wasteful number, since it uses less digits than its factorization.

21260650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7278 (or 7273 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21260650 is about 4610.9272386365. The cubic root of 21260650 is about 277.0291775492.

Adding to 21260650 its reverse (5606212), we get a palindrome (26866862).

The spelling of 21260650 in words is "twenty-one million, two hundred sixty thousand, six hundred fifty".