21334365 has 24 divisors (see below), whose sum is σ = 39825240. Its totient is φ = 10502784.

The previous prime is 21334333. The next prime is 21334373. The reversal of 21334365 is 56343312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45369 + 21288996 = 213^2 + 4614^2 .

It is not a de Polignac number, because 21334365 - 2⁵ = 21334333 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17650 + ... + 18819.

It is an arithmetic number, because the mean of its divisors is an integer number (1659385).

Almost surely, 2^21334365 is an apocalyptic number.

It is an amenable number.

21334365 is a deficient number, since it is larger than the sum of its proper divisors (18490875).

21334365 is a wasteful number, since it uses less digits than its factorization.

21334365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36493 (or 36490 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 21334365 is about 4618.9138333595. The cubic root of 21334365 is about 277.3489804039.

Adding to 21334365 its reverse (56343312), we get a palindrome (77677677).

The spelling of 21334365 in words is "twenty-one million, three hundred thirty-four thousand, three hundred sixty-five".