21265147 has 8 divisors (see below), whose sum is σ = 22643712. Its totient is φ = 19900800.

The previous prime is 21265129. The next prime is 21265151. The reversal of 21265147 is 74156212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21265147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21265747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379 + ... + 6532.

It is an arithmetic number, because the mean of its divisors is an integer number (2830464).

Almost surely, 2^21265147 is an apocalyptic number.

21265147 is a deficient number, since it is larger than the sum of its proper divisors (1378565).

21265147 is a wasteful number, since it uses less digits than its factorization.

21265147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7109.

The product of its digits is 3360, while the sum is 28.

The square root of 21265147 is about 4611.4148588042. The cubic root of 21265147 is about 277.0487083473.

It can be divided in two parts, 21265 and 147, that added together give a palindrome (21412).

The spelling of 21265147 in words is "twenty-one million, two hundred sixty-five thousand, one hundred forty-seven".