21348863 has 8 divisors (see below), whose sum is σ = 22095360. Its totient is φ = 20606040.

The previous prime is 21348851. The next prime is 21348883. The reversal of 21348863 is 36884312.

It is a happy number.

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 21348863 - 2¹² = 21344767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348883) 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, 16328 + ... + 17586.

It is an arithmetic number, because the mean of its divisors is an integer number (2761920).

Almost surely, 2^21348863 is an apocalyptic number.

21348863 is a deficient number, since it is larger than the sum of its proper divisors (746497).

21348863 is a wasteful number, since it uses less digits than its factorization.

21348863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837.

The product of its digits is 27648, while the sum is 35.

The square root of 21348863 is about 4620.4829834120. The cubic root of 21348863 is about 277.4117913511.

The spelling of 21348863 in words is "twenty-one million, three hundred forty-eight thousand, eight hundred sixty-three".