21535368 has 16 divisors (see below), whose sum is σ = 53838480. Its totient is φ = 7178448.

The previous prime is 21535363. The next prime is 21535391. The reversal of 21535368 is 86353512.

It is not an unprimeable number, because it can be changed into a prime (21535363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448630 + ... + 448677.

It is an arithmetic number, because the mean of its divisors is an integer number (3364905).

Almost surely, 2^21535368 is an apocalyptic number.

It is an amenable number.

21535368 is an abundant number, since it is smaller than the sum of its proper divisors (32303112).

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

21535368 is a wasteful number, since it uses less digits than its factorization.

21535368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897316 (or 897312 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 21535368 is about 4640.6215100997. The cubic root of 21535368 is about 278.2172791970.

The spelling of 21535368 in words is "twenty-one million, five hundred thirty-five thousand, three hundred sixty-eight".