21369536 has 28 divisors (see below), whose sum is σ = 42565320. Its totient is φ = 10644480.

The previous prime is 21369533. The next prime is 21369577. The reversal of 21369536 is 63596312.

It is a junction number, because it is equal to n+sod(n) for n = 21369496 and 21369505.

It is not an unprimeable number, because it can be changed into a prime (21369533) 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, 23816 + ... + 24696.

It is an arithmetic number, because the mean of its divisors is an integer number (1520190).

Almost surely, 2^21369536 is an apocalyptic number.

It is an amenable number.

21369536 is a deficient number, since it is larger than the sum of its proper divisors (21195784).

21369536 is an equidigital number, since it uses as much as digits as its factorization.

21369536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1262 counting only the distinct ones).

The product of its digits is 29160, while the sum is 35.

The square root of 21369536 is about 4622.7195458950. The cubic root of 21369536 is about 277.5013056238.

The spelling of 21369536 in words is "twenty-one million, three hundred sixty-nine thousand, five hundred thirty-six".