21363835 has 4 divisors (see below), whose sum is σ = 25636608. Its totient is φ = 17091064.

The previous prime is 21363833. The next prime is 21363857. The reversal of 21363835 is 53836312.

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 21363835 - 2¹ = 21363833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21363797 and 21363806.

It is not an unprimeable number, because it can be changed into a prime (21363833) 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, 2136379 + ... + 2136388.

It is an arithmetic number, because the mean of its divisors is an integer number (6409152).

Almost surely, 2^21363835 is an apocalyptic number.

21363835 is a deficient number, since it is larger than the sum of its proper divisors (4272773).

21363835 is an equidigital number, since it uses as much as digits as its factorization.

21363835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272772.

The product of its digits is 12960, while the sum is 31.

The square root of 21363835 is about 4622.1028763973. The cubic root of 21363835 is about 277.4766260106.

The spelling of 21363835 in words is "twenty-one million, three hundred sixty-three thousand, eight hundred thirty-five".