21741873724 has 12 divisors (see below), whose sum is σ = 38475788400. Its totient is φ = 10748791328.

The previous prime is 21741873721. The next prime is 21741873731. The reversal of 21741873724 is 42737814712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21741873721) 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 3 ways as a sum of consecutive naturals, for example, 30535984 + ... + 30536695.

It is an arithmetic number, because the mean of its divisors is an integer number (3206315700).

Almost surely, 2^21741873724 is an apocalyptic number.

It is an amenable number.

21741873724 is a deficient number, since it is larger than the sum of its proper divisors (16733914676).

21741873724 is a wasteful number, since it uses less digits than its factorization.

21741873724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61072772 (or 61072770 counting only the distinct ones).

The product of its digits is 526848, while the sum is 46.

The spelling of 21741873724 in words is "twenty-one billion, seven hundred forty-one million, eight hundred seventy-three thousand, seven hundred twenty-four".