21333465 has 12 divisors (see below), whose sum is σ = 36978084. Its totient is φ = 11377824.

The previous prime is 21333451. The next prime is 21333467. The reversal of 21333465 is 56433312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15515721 + 5817744 = 3939^2 + 2412^2 .

It is not a de Polignac number, because 21333465 - 2¹⁴ = 21317081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21333467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236994 + ... + 237083.

It is an arithmetic number, because the mean of its divisors is an integer number (3081507).

Almost surely, 2^21333465 is an apocalyptic number.

It is an amenable number.

21333465 is a deficient number, since it is larger than the sum of its proper divisors (15644619).

21333465 is a wasteful number, since it uses less digits than its factorization.

21333465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474088 (or 474085 counting only the distinct ones).

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

The square root of 21333465 is about 4618.8164068298. The cubic root of 21333465 is about 277.3450803176.

Adding to 21333465 its reverse (56433312), we get a palindrome (77766777).

The spelling of 21333465 in words is "twenty-one million, three hundred thirty-three thousand, four hundred sixty-five".