21047273012 has 24 divisors (see below), whose sum is σ = 37260271104. Its totient is φ = 10401760512.

The previous prime is 21047272979. The next prime is 21047273017. The reversal of 21047273012 is 21037274012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21047273017) 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 7 ways as a sum of consecutive naturals, for example, 270893 + ... + 339819.

It is an arithmetic number, because the mean of its divisors is an integer number (1552511296).

Almost surely, 2^21047273012 is an apocalyptic number.

It is an amenable number.

21047273012 is a deficient number, since it is larger than the sum of its proper divisors (16212998092).

21047273012 is a wasteful number, since it uses less digits than its factorization.

21047273012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69815 (or 69813 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The spelling of 21047273012 in words is "twenty-one billion, forty-seven million, two hundred seventy-three thousand, twelve".