21068979012 has 30 divisors (see below), whose sum is σ = 55078473758. Its totient is φ = 7022992896.

The previous prime is 21068979007. The next prime is 21068979049. The reversal of 21068979012 is 21097986012.

It can be written as a sum of positive squares in only one way, i.e., 20057357376 + 1011621636 = 141624^2 + 31806^2 .

It is a super-2 number, since 2×21068979012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 32513533 + ... + 32514180.

Almost surely, 2^21068979012 is an apocalyptic number.

It is an amenable number.

21068979012 is an abundant number, since it is smaller than the sum of its proper divisors (34009494746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21068979012 is a wasteful number, since it uses less digits than its factorization.

21068979012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65027729 (or 65027718 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 21068979012 in words is "twenty-one billion, sixty-eight million, nine hundred seventy-nine thousand, twelve".