21199707667 has 2 divisors, whose sum is σ = 21199707668. Its totient is φ = 21199707666.

The previous prime is 21199707593. The next prime is 21199707677. The reversal of 21199707667 is 76670799112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21199707667 is a prime.

It is not a weakly prime, because it can be changed into another prime (21199707677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10599853833 + 10599853834.

It is an arithmetic number, because the mean of its divisors is an integer number (10599853834).

Almost surely, 2^21199707667 is an apocalyptic number.

21199707667 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199707667 is an equidigital number, since it uses as much as digits as its factorization.

21199707667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 55.

The spelling of 21199707667 in words is "twenty-one billion, one hundred ninety-nine million, seven hundred seven thousand, six hundred sixty-seven".