21431332323439 has 4 divisors (see below), whose sum is σ = 21431350713256. Its totient is φ = 21431313933624.

The previous prime is 21431332323433. The next prime is 21431332323463. The reversal of 21431332323439 is 93432323313412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21431332323439 - 2²³ = 21431323934831 is a prime.

It is a super-2 number, since 2×21431332323439² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21431332323395 and 21431332323404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431332323433) 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, 7319289 + ... + 9820114.

It is an arithmetic number, because the mean of its divisors is an integer number (5357837678314).

Almost surely, 2^{21431332323439} is an apocalyptic number.

21431332323439 is a deficient number, since it is larger than the sum of its proper divisors (18389817).

21431332323439 is a wasteful number, since it uses less digits than its factorization.

21431332323439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18389816.

The product of its digits is 839808, while the sum is 43.

The spelling of 21431332323439 in words is "twenty-one trillion, four hundred thirty-one billion, three hundred thirty-two million, three hundred twenty-three thousand, four hundred thirty-nine".