21336354 has 48 divisors (see below), whose sum is σ = 52416000. Its totient is φ = 6218208.

The previous prime is 21336349. The next prime is 21336389. The reversal of 21336354 is 45363312.

It is a happy number.

21336354 is a `hidden beast` number, since 21 + 3 + 3 + 635 + 4 = 666.

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, 2047 + ... + 6845.

It is an arithmetic number, because the mean of its divisors is an integer number (1092000).

Almost surely, 2^21336354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21336354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26208000).

21336354 is an abundant number, since it is smaller than the sum of its proper divisors (31079646).

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

21336354 is a wasteful number, since it uses less digits than its factorization.

21336354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4839 (or 4836 counting only the distinct ones).

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

The square root of 21336354 is about 4619.1291387014. The cubic root of 21336354 is about 277.3575992055.

Adding to 21336354 its reverse (45363312), we get a palindrome (66699666).

The spelling of 21336354 in words is "twenty-one million, three hundred thirty-six thousand, three hundred fifty-four".