21312432225439 has 8 divisors (see below), whose sum is σ = 21329786636928. Its totient is φ = 21295079126040.

The previous prime is 21312432225397. The next prime is 21312432225443. The reversal of 21312432225439 is 93452223421312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21312432225439 - 2¹³ = 21312432217247 is a prime.

It is a super-2 number, since 2×21312432225439² (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 = 21312432225395 and 21312432225404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312432285439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33596454 + ... + 34224940.

It is an arithmetic number, because the mean of its divisors is an integer number (2666223329616).

Almost surely, 2^{21312432225439} is an apocalyptic number.

21312432225439 is a deficient number, since it is larger than the sum of its proper divisors (17354411489).

21312432225439 is a wasteful number, since it uses less digits than its factorization.

21312432225439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656045.

The product of its digits is 622080, while the sum is 43.

The spelling of 21312432225439 in words is "twenty-one trillion, three hundred twelve billion, four hundred thirty-two million, two hundred twenty-five thousand, four hundred thirty-nine".