21344036 has 24 divisors (see below), whose sum is σ = 42872256. Its totient is φ = 9108000.

The previous prime is 21344033. The next prime is 21344051. The reversal of 21344036 is 63044312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21344033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5510 + ... + 8546.

It is an arithmetic number, because the mean of its divisors is an integer number (1786344).

Almost surely, 2^21344036 is an apocalyptic number.

It is an amenable number.

21344036 is an abundant number, since it is smaller than the sum of its proper divisors (21528220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344036 is a wasteful number, since it uses less digits than its factorization.

21344036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299 (or 3297 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 21344036 is about 4619.9606058927. The cubic root of 21344036 is about 277.3908820776.

Adding to 21344036 its reverse (63044312), we get a palindrome (84388348).

The spelling of 21344036 in words is "twenty-one million, three hundred forty-four thousand, thirty-six".