6967138921 has 2 divisors, whose sum is σ = 6967138922. Its totient is φ = 6967138920.

The previous prime is 6967138891. The next prime is 6967138931. The reversal of 6967138921 is 1298317696.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5135298921 + 1831840000 = 71661^2 + 42800^2 .

It is a cyclic number.

It is not a de Polignac number, because 6967138921 - 2⁵ = 6967138889 is a prime.

It is not a weakly prime, because it can be changed into another prime (6967138931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3483569460 + 3483569461.

It is an arithmetic number, because the mean of its divisors is an integer number (3483569461).

Almost surely, 2^6967138921 is an apocalyptic number.

It is an amenable number.

6967138921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6967138921 is an equidigital number, since it uses as much as digits as its factorization.

6967138921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 6967138921 is about 83469.3891255950. The cubic root of 6967138921 is about 1909.9331063074.

The spelling of 6967138921 in words is "six billion, nine hundred sixty-seven million, one hundred thirty-eight thousand, nine hundred twenty-one".