210996558691 has 2 divisors, whose sum is σ = 210996558692. Its totient is φ = 210996558690.

The previous prime is 210996558677. The next prime is 210996558697. The reversal of 210996558691 is 196855699012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210996558691 is a prime.

It is not a weakly prime, because it can be changed into another prime (210996558697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105498279345 + 105498279346.

It is an arithmetic number, because the mean of its divisors is an integer number (105498279346).

Almost surely, 2^210996558691 is an apocalyptic number.

210996558691 is a deficient number, since it is larger than the sum of its proper divisors (1).

210996558691 is an equidigital number, since it uses as much as digits as its factorization.

210996558691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10497600, while the sum is 61.

The spelling of 210996558691 in words is "two hundred ten billion, nine hundred ninety-six million, five hundred fifty-eight thousand, six hundred ninety-one".