21147126424 has 16 divisors (see below), whose sum is σ = 41018133600. Its totient is φ = 10208957472.

The previous prime is 21147126397. The next prime is 21147126479. The reversal of 21147126424 is 42462174112.

It is a self number, because there is not a number n which added to its sum of digits gives 21147126424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45575472 + ... + 45575935.

It is an arithmetic number, because the mean of its divisors is an integer number (2563633350).

Almost surely, 2^21147126424 is an apocalyptic number.

It is an amenable number.

21147126424 is a deficient number, since it is larger than the sum of its proper divisors (19871007176).

21147126424 is a wasteful number, since it uses less digits than its factorization.

21147126424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91151442 (or 91151438 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The spelling of 21147126424 in words is "twenty-one billion, one hundred forty-seven million, one hundred twenty-six thousand, four hundred twenty-four".