21048863 has 4 divisors (see below), whose sum is σ = 22962408. Its totient is φ = 19135320.

The previous prime is 21048857. The next prime is 21048889. The reversal of 21048863 is 36884012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21048863 - 2¹⁸ = 20786719 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 (21048803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956756 + ... + 956777.

It is an arithmetic number, because the mean of its divisors is an integer number (5740602).

Almost surely, 2^21048863 is an apocalyptic number.

21048863 is a deficient number, since it is larger than the sum of its proper divisors (1913545).

21048863 is a wasteful number, since it uses less digits than its factorization.

21048863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913544.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21048863 is about 4587.9039876615. The cubic root of 21048863 is about 276.1062349214.

The spelling of 21048863 in words is "twenty-one million, forty-eight thousand, eight hundred sixty-three".