21373360 has 20 divisors (see below), whose sum is σ = 49693248. Its totient is φ = 8549312.

The previous prime is 21373351. The next prime is 21373361. The reversal of 21373360 is 6337312.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (21373361) 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, 133504 + ... + 133663.

Almost surely, 2^21373360 is an apocalyptic number.

21373360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21373360 is an abundant number, since it is smaller than the sum of its proper divisors (28319888).

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

21373360 is a wasteful number, since it uses less digits than its factorization.

21373360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267180 (or 267174 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 25.

The square root of 21373360 is about 4623.1331367375. The cubic root of 21373360 is about 277.5178572498.

The spelling of 21373360 in words is "twenty-one million, three hundred seventy-three thousand, three hundred sixty".