67921999 has 2 divisors, whose sum is σ = 67922000. Its totient is φ = 67921998.

The previous prime is 67921963. The next prime is 67922027. The reversal of 67921999 is 99912976.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67921999 is a prime.

It is a super-2 number, since 2×67921999² = 9226795896312002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67921949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33960999 + 33961000.

It is an arithmetic number, because the mean of its divisors is an integer number (33961000).

Almost surely, 2^67921999 is an apocalyptic number.

67921999 is a deficient number, since it is larger than the sum of its proper divisors (1).

67921999 is an equidigital number, since it uses as much as digits as its factorization.

67921999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 52.

The square root of 67921999 is about 8241.4803888622. The cubic root of 67921999 is about 408.0093851968.

The spelling of 67921999 in words is "sixty-seven million, nine hundred twenty-one thousand, nine hundred ninety-nine".