21305469412 has 12 divisors (see below), whose sum is σ = 37285838716. Its totient is φ = 10652372640.

The previous prime is 21305469403. The next prime is 21305469413. The reversal of 21305469412 is 21496450312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3179155456 + 18126313956 = 56384^2 + 134634^2 .

It is not an unprimeable number, because it can be changed into a prime (21305469413) 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, 75862 + ... + 219922.

Almost surely, 2^21305469412 is an apocalyptic number.

It is an amenable number.

21305469412 is a deficient number, since it is larger than the sum of its proper divisors (15980369304).

21305469412 is a wasteful number, since it uses less digits than its factorization.

21305469412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181038 (or 181036 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21305469412 in words is "twenty-one billion, three hundred five million, four hundred sixty-nine thousand, four hundred twelve".