21265607 has 8 divisors (see below), whose sum is σ = 23738880. Its totient is φ = 18882360.

The previous prime is 21265603. The next prime is 21265619. The reversal of 21265607 is 70656212.

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

It is a cyclic number.

It is not a de Polignac number, because 21265607 - 2² = 21265603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21265607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22007 + ... + 22952.

It is an arithmetic number, because the mean of its divisors is an integer number (2967360).

Almost surely, 2^21265607 is an apocalyptic number.

21265607 is a deficient number, since it is larger than the sum of its proper divisors (2473273).

21265607 is a wasteful number, since it uses less digits than its factorization.

21265607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45013.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21265607 is about 4611.4647347670. The cubic root of 21265607 is about 277.0507060055.

The spelling of 21265607 in words is "twenty-one million, two hundred sixty-five thousand, six hundred seven".