21473480 has 64 divisors (see below), whose sum is σ = 56298240. Its totient is φ = 7218432.

The previous prime is 21473479. The next prime is 21473489. The reversal of 21473480 is 8437412.

It is a super-2 number, since 2×21473480² = 922220686620800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473489) 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 15 ways as a sum of consecutive naturals, for example, 14117 + ... + 15563.

It is an arithmetic number, because the mean of its divisors is an integer number (879660).

Almost surely, 2^21473480 is an apocalyptic number.

21473480 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 21473480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28149120).

21473480 is an abundant number, since it is smaller than the sum of its proper divisors (34824760).

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

21473480 is a wasteful number, since it uses less digits than its factorization.

21473480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21473480 is about 4633.9486401988. The cubic root of 21473480 is about 277.9505113501.

The spelling of 21473480 in words is "twenty-one million, four hundred seventy-three thousand, four hundred eighty".