21301265 has 8 divisors (see below), whose sum is σ = 25634880. Its totient is φ = 16992112.

The previous prime is 21301253. The next prime is 21301277. The reversal of 21301265 is 56210312.

It is an interprime number because it is at equal distance from previous prime (21301253) and next prime (21301277).

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 21301265 - 2⁶ = 21301201 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4139 + ... + 7728.

It is an arithmetic number, because the mean of its divisors is an integer number (3204360).

Almost surely, 2^21301265 is an apocalyptic number.

It is an amenable number.

21301265 is a deficient number, since it is larger than the sum of its proper divisors (4333615).

21301265 is a wasteful number, since it uses less digits than its factorization.

21301265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21301265 is about 4615.3293490281. The cubic root of 21301265 is about 277.2054716716.

Adding to 21301265 its reverse (56210312), we get a palindrome (77511577).

The spelling of 21301265 in words is "twenty-one million, three hundred one thousand, two hundred sixty-five".