21232342409 has 2 divisors, whose sum is σ = 21232342410. Its totient is φ = 21232342408.

The previous prime is 21232342403. The next prime is 21232342493. The reversal of 21232342409 is 90424323212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18528654400 + 2703688009 = 136120^2 + 51997^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232342409 - 2²⁰ = 21231293833 is a prime.

It is not a weakly prime, because it can be changed into another prime (21232342403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616171204 + 10616171205.

It is an arithmetic number, because the mean of its divisors is an integer number (10616171205).

Almost surely, 2^21232342409 is an apocalyptic number.

It is an amenable number.

21232342409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232342409 is an equidigital number, since it uses as much as digits as its factorization.

21232342409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 21232342409 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, four hundred nine".