21473147520 has 512 divisors, whose sum is σ = 83571782400. Its totient is φ = 5167595520.

The previous prime is 21473147519. The next prime is 21473147533. The reversal of 21473147520 is 2574137412.

21473147520 is a `hidden beast` number, since 21 + 4 + 73 + 1 + 47 + 520 = 666.

It is a super-2 number, since 2×21473147520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32883514 + ... + 32884166.

Almost surely, 2^21473147520 is an apocalyptic number.

21473147520 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 21473147520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41785891200).

21473147520 is an abundant number, since it is smaller than the sum of its proper divisors (62098634880).

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

21473147520 is a wasteful number, since it uses less digits than its factorization.

21473147520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 847 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The spelling of 21473147520 in words is "twenty-one billion, four hundred seventy-three million, one hundred forty-seven thousand, five hundred twenty".