210840245683 has 2 divisors, whose sum is σ = 210840245684. Its totient is φ = 210840245682.

The previous prime is 210840245633. The next prime is 210840245701. The reversal of 210840245683 is 386542048012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210840245683 is a prime.

It is not a weakly prime, because it can be changed into another prime (210840245633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105420122841 + 105420122842.

It is an arithmetic number, because the mean of its divisors is an integer number (105420122842).

Almost surely, 2^210840245683 is an apocalyptic number.

210840245683 is a deficient number, since it is larger than the sum of its proper divisors (1).

210840245683 is an equidigital number, since it uses as much as digits as its factorization.

210840245683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 210840245683 in words is "two hundred ten billion, eight hundred forty million, two hundred forty-five thousand, six hundred eighty-three".