21268847 has 8 divisors (see below), whose sum is σ = 22811760. Its totient is φ = 19768320.

The previous prime is 21268837. The next prime is 21268867. The reversal of 21268847 is 74886212.

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 21268847 - 2⁸ = 21268591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21268847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268837) 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, 9554 + ... + 11567.

It is an arithmetic number, because the mean of its divisors is an integer number (2851470).

Almost surely, 2^21268847 is an apocalyptic number.

21268847 is a deficient number, since it is larger than the sum of its proper divisors (1542913).

21268847 is a wasteful number, since it uses less digits than its factorization.

21268847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21193.

The product of its digits is 43008, while the sum is 38.

The square root of 21268847 is about 4611.8160197475. The cubic root of 21268847 is about 277.0647756517.

The spelling of 21268847 in words is "twenty-one million, two hundred sixty-eight thousand, eight hundred forty-seven".