21181975486 has 24 divisors (see below), whose sum is σ = 39134529216. Its totient is φ = 8543989440.

The previous prime is 21181975481. The next prime is 21181975513. The reversal of 21181975486 is 68457918112.

21181975486 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21181975481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6355470 + ... + 6358801.

It is an arithmetic number, because the mean of its divisors is an integer number (1630605384).

Almost surely, 2^21181975486 is an apocalyptic number.

21181975486 is a deficient number, since it is larger than the sum of its proper divisors (17952553730).

21181975486 is a wasteful number, since it uses less digits than its factorization.

21181975486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12714304 (or 12714297 counting only the distinct ones).

The product of its digits is 967680, while the sum is 52.

The spelling of 21181975486 in words is "twenty-one billion, one hundred eighty-one million, nine hundred seventy-five thousand, four hundred eighty-six".