21324671567 has 2 divisors, whose sum is σ = 21324671568. Its totient is φ = 21324671566.

The previous prime is 21324671507. The next prime is 21324671611. The reversal of 21324671567 is 76517642312.

It is a happy number.

It is an a-pointer prime, because the next prime (21324671611) can be obtained adding 21324671567 to its sum of digits (44).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21324671567 - 2¹⁸ = 21324409423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324671507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662335783 + 10662335784.

It is an arithmetic number, because the mean of its divisors is an integer number (10662335784).

Almost surely, 2^21324671567 is an apocalyptic number.

21324671567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324671567 is an equidigital number, since it uses as much as digits as its factorization.

21324671567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 44.

The spelling of 21324671567 in words is "twenty-one billion, three hundred twenty-four million, six hundred seventy-one thousand, five hundred sixty-seven".