21336452 has 12 divisors (see below), whose sum is σ = 37709196. Its totient is φ = 10562400.

The previous prime is 21336409. The next prime is 21336467. The reversal of 21336452 is 25463312.

It can be written as a sum of positive squares in 2 ways, for example, as 8620096 + 12716356 = 2936^2 + 3566^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26003 + ... + 26810.

It is an arithmetic number, because the mean of its divisors is an integer number (3142433).

Almost surely, 2^21336452 is an apocalyptic number.

It is an amenable number.

21336452 is a deficient number, since it is larger than the sum of its proper divisors (16372744).

21336452 is a wasteful number, since it uses less digits than its factorization.

21336452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52918 (or 52916 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 21336452 is about 4619.1397467494. The cubic root of 21336452 is about 277.3580238486.

Adding to 21336452 its reverse (25463312), we get a palindrome (46799764).

The spelling of 21336452 in words is "twenty-one million, three hundred thirty-six thousand, four hundred fifty-two".