21728475480 has 64 divisors (see below), whose sum is σ = 65259567360. Its totient is φ = 5787669888.

The previous prime is 21728475479. The next prime is 21728475511. The reversal of 21728475480 is 8457482712.

It is a super-2 number, since 2×21728475480² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3429 + ... + 208491.

It is an arithmetic number, because the mean of its divisors is an integer number (1019680740).

Almost surely, 2^21728475480 is an apocalyptic number.

21728475480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21728475480 is an abundant number, since it is smaller than the sum of its proper divisors (43531091880).

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

21728475480 is a wasteful number, since it uses less digits than its factorization.

21728475480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205960 (or 205956 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 48.

The spelling of 21728475480 in words is "twenty-one billion, seven hundred twenty-eight million, four hundred seventy-five thousand, four hundred eighty".