6994071221 has 2 divisors, whose sum is σ = 6994071222. Its totient is φ = 6994071220.

The previous prime is 6994071211. The next prime is 6994071233. The reversal of 6994071221 is 1221704996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6973920100 + 20151121 = 83510^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 6994071221 - 2¹⁰ = 6994070197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6994071211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497035610 + 3497035611.

It is an arithmetic number, because the mean of its divisors is an integer number (3497035611).

Almost surely, 2^6994071221 is an apocalyptic number.

It is an amenable number.

6994071221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6994071221 is an equidigital number, since it uses as much as digits as its factorization.

6994071221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 6994071221 is about 83630.5639165491. The cubic root of 6994071221 is about 1912.3909661222.

The spelling of 6994071221 in words is "six billion, nine hundred ninety-four million, seventy-one thousand, two hundred twenty-one".