21305450312 has 16 divisors (see below), whose sum is σ = 40010049900. Its totient is φ = 10636103680.

The previous prime is 21305450273. The next prime is 21305450317.

It is a happy number.

21305450312 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 20607750916 + 697699396 = 143554^2 + 26414^2 .

It is not an unprimeable number, because it can be changed into a prime (21305450317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072237 + ... + 2082492.

Almost surely, 2^21305450312 is an apocalyptic number.

It is an amenable number.

21305450312 is a deficient number, since it is larger than the sum of its proper divisors (18704599588).

21305450312 is a wasteful number, since it uses less digits than its factorization.

21305450312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155376 (or 4155372 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 21305450312 in words is "twenty-one billion, three hundred five million, four hundred fifty thousand, three hundred twelve".