21673360 has 40 divisors (see below), whose sum is σ = 52585920. Its totient is φ = 8291712.

The previous prime is 21673339. The next prime is 21673367. The reversal of 21673360 is 6337612.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21673367) 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 7 ways as a sum of consecutive naturals, for example, 4050 + ... + 7729.

It is an arithmetic number, because the mean of its divisors is an integer number (1314648).

Almost surely, 2^21673360 is an apocalyptic number.

21673360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21673360 is an abundant number, since it is smaller than the sum of its proper divisors (30912560).

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

21673360 is a wasteful number, since it uses less digits than its factorization.

21673360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11815 (or 11809 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21673360 is about 4655.4656050711. The cubic root of 21673360 is about 278.8102579751.

The spelling of 21673360 in words is "twenty-one million, six hundred seventy-three thousand, three hundred sixty".