21353346 has 24 divisors (see below), whose sum is σ = 52875264. Its totient is φ = 6100920.

The previous prime is 21353281. The next prime is 21353347. The reversal of 21353346 is 64335312.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21353347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84610 + ... + 84861.

It is an arithmetic number, because the mean of its divisors is an integer number (2203136).

Almost surely, 2^21353346 is an apocalyptic number.

21353346 is an abundant number, since it is smaller than the sum of its proper divisors (31521918).

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

21353346 is a wasteful number, since it uses less digits than its factorization.

21353346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169486 (or 169483 counting only the distinct ones).

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

The square root of 21353346 is about 4620.9680803918. The cubic root of 21353346 is about 277.4312076860.

Adding to 21353346 its reverse (64335312), we get a palindrome (85688658).

The spelling of 21353346 in words is "twenty-one million, three hundred fifty-three thousand, three hundred forty-six".