21324322342391 has 2 divisors, whose sum is σ = 21324322342392. Its totient is φ = 21324322342390.

The previous prime is 21324322342159. The next prime is 21324322342447. The reversal of 21324322342391 is 19324322342312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21324322342391 - 2¹⁴ = 21324322326007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324322342591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662161171195 + 10662161171196.

It is an arithmetic number, because the mean of its divisors is an integer number (10662161171196).

Almost surely, 2^{21324322342391} is an apocalyptic number.

21324322342391 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324322342391 is an equidigital number, since it uses as much as digits as its factorization.

21324322342391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 41.

The spelling of 21324322342391 in words is "twenty-one trillion, three hundred twenty-four billion, three hundred twenty-two million, three hundred forty-two thousand, three hundred ninety-one".