21363893 has 4 divisors (see below), whose sum is σ = 21553068. Its totient is φ = 21174720.

The previous prime is 21363887. The next prime is 21363899. The reversal of 21363893 is 39836312.

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

It is an interprime number because it is at equal distance from previous prime (21363887) and next prime (21363899).

It can be written as a sum of positive squares in 2 ways, for example, as 1800964 + 19562929 = 1342^2 + 4423^2 .

It is a cyclic number.

It is not a de Polignac number, because 21363893 - 2⁴ = 21363877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363899) 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, 94418 + ... + 94643.

It is an arithmetic number, because the mean of its divisors is an integer number (5388267).

Almost surely, 2^21363893 is an apocalyptic number.

It is an amenable number.

21363893 is a deficient number, since it is larger than the sum of its proper divisors (189175).

21363893 is a wasteful number, since it uses less digits than its factorization.

21363893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189174.

The product of its digits is 23328, while the sum is 35.

The square root of 21363893 is about 4622.1091505935. The cubic root of 21363893 is about 277.4768771145.

The spelling of 21363893 in words is "twenty-one million, three hundred sixty-three thousand, eight hundred ninety-three".