21473556160 has 224 divisors, whose sum is σ = 61564723200. Its totient is φ = 7123737600.

The previous prime is 21473556133. The next prime is 21473556197. The reversal of 21473556160 is 6165537412.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×21473556160² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3399405 + ... + 3405715.

Almost surely, 2^21473556160 is an apocalyptic number.

21473556160 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 21473556160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30782361600).

21473556160 is an abundant number, since it is smaller than the sum of its proper divisors (40091167040).

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

21473556160 is an equidigital number, since it uses as much as digits as its factorization.

21473556160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6380 (or 6356 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 21473556160 in words is "twenty-one billion, four hundred seventy-three million, five hundred fifty-six thousand, one hundred sixty".