67886921 has 2 divisors, whose sum is σ = 67886922. Its totient is φ = 67886920.

The previous prime is 67886911. The next prime is 67886927. The reversal of 67886921 is 12968876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67831696 + 55225 = 8236^2 + 235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67886921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67886927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33943460 + 33943461.

It is an arithmetic number, because the mean of its divisors is an integer number (33943461).

Almost surely, 2^67886921 is an apocalyptic number.

It is an amenable number.

67886921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67886921 is an equidigital number, since it uses as much as digits as its factorization.

67886921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 67886921 is about 8239.3519769458. The cubic root of 67886921 is about 407.9391349198.

The spelling of 67886921 in words is "sixty-seven million, eight hundred eighty-six thousand, nine hundred twenty-one".