21265353 has 6 divisors (see below), whose sum is σ = 30716634. Its totient is φ = 14176896.

The previous prime is 21265337. The next prime is 21265373. The reversal of 21265353 is 35356212.

21265353 is a `hidden beast` number, since 2 + 1 + 2 + 653 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14040009 + 7225344 = 3747^2 + 2688^2 .

It is not a de Polignac number, because 21265353 - 2⁴ = 21265337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21265303) 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 5 ways as a sum of consecutive naturals, for example, 1181400 + ... + 1181417.

It is an arithmetic number, because the mean of its divisors is an integer number (5119439).

Almost surely, 2^21265353 is an apocalyptic number.

It is an amenable number.

21265353 is a deficient number, since it is larger than the sum of its proper divisors (9451281).

21265353 is a wasteful number, since it uses less digits than its factorization.

21265353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362823 (or 2362820 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 21265353 is about 4611.4371946282. The cubic root of 21265353 is about 277.0496029543.

The spelling of 21265353 in words is "twenty-one million, two hundred sixty-five thousand, three hundred fifty-three".