21667357519 has 2 divisors, whose sum is σ = 21667357520. Its totient is φ = 21667357518.

The previous prime is 21667357507. The next prime is 21667357549. The reversal of 21667357519 is 91575376612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21667357519 - 2²³ = 21658968911 is a prime.

It is a super-2 number, since 2×21667357519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21667357549) 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, 10833678759 + 10833678760.

It is an arithmetic number, because the mean of its divisors is an integer number (10833678760).

Almost surely, 2^21667357519 is an apocalyptic number.

21667357519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667357519 is an equidigital number, since it uses as much as digits as its factorization.

21667357519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2381400, while the sum is 52.

The spelling of 21667357519 in words is "twenty-one billion, six hundred sixty-seven million, three hundred fifty-seven thousand, five hundred nineteen".