21667357219 has 2 divisors, whose sum is σ = 21667357220. Its totient is φ = 21667357218.

The previous prime is 21667357193. The next prime is 21667357241. The reversal of 21667357219 is 91275376612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21667357219 - 2¹³ = 21667349027 is a prime.

It is a super-2 number, since 2×21667357219² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21667357519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833678609 + 10833678610.

It is an arithmetic number, because the mean of its divisors is an integer number (10833678610).

Almost surely, 2^21667357219 is an apocalyptic number.

21667357219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667357219 is an equidigital number, since it uses as much as digits as its factorization.

21667357219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The spelling of 21667357219 in words is "twenty-one billion, six hundred sixty-seven million, three hundred fifty-seven thousand, two hundred nineteen".