21667167007 has 2 divisors, whose sum is σ = 21667167008. Its totient is φ = 21667167006.

The previous prime is 21667166993. The next prime is 21667167019. The reversal of 21667167007 is 70076176612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21667167007 - 2²³ = 21658778399 is a prime.

It is a super-2 number, since 2×21667167007² (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 (21667167077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833583503 + 10833583504.

It is an arithmetic number, because the mean of its divisors is an integer number (10833583504).

Almost surely, 2^21667167007 is an apocalyptic number.

21667167007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667167007 is an equidigital number, since it uses as much as digits as its factorization.

21667167007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 43.

The spelling of 21667167007 in words is "twenty-one billion, six hundred sixty-seven million, one hundred sixty-seven thousand, seven".