21136363 has 4 divisors (see below), whose sum is σ = 21148128. Its totient is φ = 21124600.

The previous prime is 21136319. The next prime is 21136369. The reversal of 21136363 is 36363112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21136363 - 2¹⁷ = 21005291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21136369) 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, 2563 + ... + 6988.

It is an arithmetic number, because the mean of its divisors is an integer number (5287032).

Almost surely, 2^21136363 is an apocalyptic number.

21136363 is a deficient number, since it is larger than the sum of its proper divisors (11765).

21136363 is an equidigital number, since it uses as much as digits as its factorization.

21136363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11764.

The product of its digits is 1944, while the sum is 25.

The square root of 21136363 is about 4597.4300429697. The cubic root of 21136363 is about 276.4882966662.

Adding to 21136363 its reverse (36363112), we get a palindrome (57499475).

The spelling of 21136363 in words is "twenty-one million, one hundred thirty-six thousand, three hundred sixty-three".