21363043 has 4 divisors (see below), whose sum is σ = 23006368. Its totient is φ = 19719720.

The previous prime is 21363037. The next prime is 21363047. The reversal of 21363043 is 34036312.

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 21363043 - 2¹⁷ = 21231971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21363047) 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, 821643 + ... + 821668.

It is an arithmetic number, because the mean of its divisors is an integer number (5751592).

Almost surely, 2^21363043 is an apocalyptic number.

21363043 is a deficient number, since it is larger than the sum of its proper divisors (1643325).

21363043 is a wasteful number, since it uses less digits than its factorization.

21363043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643324.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 21363043 is about 4622.0172003142. The cubic root of 21363043 is about 277.4731970974.

Adding to 21363043 its reverse (34036312), we get a palindrome (55399355).

The spelling of 21363043 in words is "twenty-one million, three hundred sixty-three thousand, forty-three".