21473160 has 64 divisors (see below), whose sum is σ = 64972800. Its totient is φ = 5677056.

The previous prime is 21473147. The next prime is 21473171. The reversal of 21473160 is 6137412.

It is a super-2 number, since 2×21473160² = 922193200771200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21473160.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14536 + ... + 15944.

It is an arithmetic number, because the mean of its divisors is an integer number (1015200).

Almost surely, 2^21473160 is an apocalyptic number.

21473160 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 21473160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32486400).

21473160 is an abundant number, since it is smaller than the sum of its proper divisors (43499640).

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

21473160 is a wasteful number, since it uses less digits than its factorization.

21473160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21473160 is about 4633.9141122813. The cubic root of 21473160 is about 277.9491306609.

The spelling of 21473160 in words is "twenty-one million, four hundred seventy-three thousand, one hundred sixty".