21667167019 has 2 divisors, whose sum is σ = 21667167020. Its totient is φ = 21667167018.

The previous prime is 21667167007. The next prime is 21667167073. The reversal of 21667167019 is 91076176612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21667167019 - 2⁵ = 21667166987 is a prime.

It is a super-2 number, since 2×21667167019² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21667167019.

It is not a weakly prime, because it can be changed into another prime (21667167079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833583509 + 10833583510.

It is an arithmetic number, because the mean of its divisors is an integer number (10833583510).

Almost surely, 2^21667167019 is an apocalyptic number.

21667167019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667167019 is an equidigital number, since it uses as much as digits as its factorization.

21667167019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 21667167019 in words is "twenty-one billion, six hundred sixty-seven million, one hundred sixty-seven thousand, nineteen".