21585841492 has 12 divisors (see below), whose sum is σ = 37884087360. Its totient is φ = 10761816536.

The previous prime is 21585841441. The next prime is 21585841493. The reversal of 21585841492 is 29414858512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21585841493) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7774492 + ... + 7777267.

It is an arithmetic number, because the mean of its divisors is an integer number (3157007280).

Almost surely, 2^21585841492 is an apocalyptic number.

It is an amenable number.

21585841492 is a deficient number, since it is larger than the sum of its proper divisors (16298245868).

21585841492 is a wasteful number, since it uses less digits than its factorization.

21585841492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15552110 (or 15552108 counting only the distinct ones).

The product of its digits is 921600, while the sum is 49.

The spelling of 21585841492 in words is "twenty-one billion, five hundred eighty-five million, eight hundred forty-one thousand, four hundred ninety-two".