21342130040321 has 16 divisors (see below), whose sum is σ = 22088384110800. Its totient is φ = 20606797056000.

The previous prime is 21342130040303. The next prime is 21342130040323. The reversal of 21342130040321 is 12304003124312.

It can be written as a sum of positive squares in 8 ways, for example, as 5139452225296 + 16202677815025 = 2267036^2 + 4025255^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342130040321 - 2³⁴ = 21324950171137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21342130040323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8814185 + ... + 10971513.

It is an arithmetic number, because the mean of its divisors is an integer number (1380524006925).

Almost surely, 2^{21342130040321} is an apocalyptic number.

It is an amenable number.

21342130040321 is a deficient number, since it is larger than the sum of its proper divisors (746254070479).

21342130040321 is a wasteful number, since it uses less digits than its factorization.

21342130040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159860.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21342130040321 its reverse (12304003124312), we get a palindrome (33646133164633).

The spelling of 21342130040321 in words is "twenty-one trillion, three hundred forty-two billion, one hundred thirty million, forty thousand, three hundred twenty-one".