21473837512 has 32 divisors (see below), whose sum is σ = 40787942400. Its totient is φ = 10597152384.

The previous prime is 21473837491. The next prime is 21473837513. The reversal of 21473837512 is 21573837412.

It is a super-2 number, since 2×21473837512² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21473837513) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2604148 + ... + 2612380.

It is an arithmetic number, because the mean of its divisors is an integer number (1274623200).

Almost surely, 2^21473837512 is an apocalyptic number.

It is an amenable number.

21473837512 is a deficient number, since it is larger than the sum of its proper divisors (19314104888).

21473837512 is a wasteful number, since it uses less digits than its factorization.

21473837512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12445 (or 12441 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The spelling of 21473837512 in words is "twenty-one billion, four hundred seventy-three million, eight hundred thirty-seven thousand, five hundred twelve".