21473481540 has 48 divisors (see below), whose sum is σ = 68715142272. Its totient is φ = 4908224256.

The previous prime is 21473481511. The next prime is 21473481551. The reversal of 21473481540 is 4518437412.

It is a super-2 number, since 2×21473481540² (a number of 21 digits) contains 22 as substring.

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, 25563249 + ... + 25564088.

It is an arithmetic number, because the mean of its divisors is an integer number (1431565464).

Almost surely, 2^21473481540 is an apocalyptic number.

21473481540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21473481540 is an abundant number, since it is smaller than the sum of its proper divisors (47241660732).

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

21473481540 is a wasteful number, since it uses less digits than its factorization.

21473481540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51127356 (or 51127354 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 21473481540 in words is "twenty-one billion, four hundred seventy-three million, four hundred eighty-one thousand, five hundred forty".