21240718076 has 12 divisors (see below), whose sum is σ = 37236359160. Its totient is φ = 10601758320.

The previous prime is 21240718049. The next prime is 21240718091. The reversal of 21240718076 is 67081704212.

It is a super-2 number, since 2×21240718076² (a number of 21 digits) contains 22 as substring.

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, 4647611 + ... + 4652178.

It is an arithmetic number, because the mean of its divisors is an integer number (3103029930).

Almost surely, 2^21240718076 is an apocalyptic number.

It is an amenable number.

21240718076 is a deficient number, since it is larger than the sum of its proper divisors (15995641084).

21240718076 is a wasteful number, since it uses less digits than its factorization.

21240718076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9300364 (or 9300362 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 21240718076 in words is "twenty-one billion, two hundred forty million, seven hundred eighteen thousand, seventy-six".