6921683213 has 2 divisors, whose sum is σ = 6921683214. Its totient is φ = 6921683212.

The previous prime is 6921683207. The next prime is 6921683231. The reversal of 6921683213 is 3123861296.

Together with next prime (6921683231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4834838089 + 2086845124 = 69533^2 + 45682^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921683213 - 2⁶ = 6921683149 is a prime.

It is a super-2 number, since 2×6921683213² = 95819397002252006738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6921683233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460841606 + 3460841607.

It is an arithmetic number, because the mean of its divisors is an integer number (3460841607).

Almost surely, 2^6921683213 is an apocalyptic number.

It is an amenable number.

6921683213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921683213 is an equidigital number, since it uses as much as digits as its factorization.

6921683213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 6921683213 is about 83196.6538569911. The cubic root of 6921683213 is about 1905.7703810036.

The spelling of 6921683213 in words is "six billion, nine hundred twenty-one million, six hundred eighty-three thousand, two hundred thirteen".