21473360 has 40 divisors (see below), whose sum is σ = 50996736. Its totient is φ = 8405120.

The previous prime is 21473351. The next prime is 21473393. The reversal of 21473360 is 6337412.

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

It is a super-2 number, since 2×21473360² = 922210379379200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905 + ... + 6615.

Almost surely, 2^21473360 is an apocalyptic number.

21473360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21473360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25498368).

21473360 is an abundant number, since it is smaller than the sum of its proper divisors (29523376).

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

21473360 is a wasteful number, since it uses less digits than its factorization.

21473360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5771 (or 5765 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21473360 is about 4633.9356922599. The cubic root of 21473360 is about 277.9499935933.

The spelling of 21473360 in words is "twenty-one million, four hundred seventy-three thousand, three hundred sixty".