21321712430344 has 16 divisors (see below), whose sum is σ = 39980614604220. Its totient is φ = 10660215202560.

The previous prime is 21321712430341. The next prime is 21321712430407. The reversal of 21321712430344 is 44303421712312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15804202702500 + 5517509727844 = 3975450^2 + 2348938^2 .

It is not an unprimeable number, because it can be changed into a prime (21321712430341) 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, 79985197 + ... + 80251324.

Almost surely, 2^{21321712430344} is an apocalyptic number.

It is an amenable number.

21321712430344 is a deficient number, since it is larger than the sum of its proper divisors (18658902173876).

21321712430344 is a wasteful number, since it uses less digits than its factorization.

21321712430344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160253160 (or 160253156 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 21321712430344 in words is "twenty-one trillion, three hundred twenty-one billion, seven hundred twelve million, four hundred thirty thousand, three hundred forty-four".