210409906673 has 2 divisors, whose sum is σ = 210409906674. Its totient is φ = 210409906672.

The previous prime is 210409906669. The next prime is 210409906793. The reversal of 210409906673 is 376609904012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155987082304 + 54422824369 = 394952^2 + 233287^2 .

It is a cyclic number.

It is not a de Polignac number, because 210409906673 - 2² = 210409906669 is a prime.

It is a super-2 number, since 2×210409906673² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210409906613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105204953336 + 105204953337.

It is an arithmetic number, because the mean of its divisors is an integer number (105204953337).

Almost surely, 2^210409906673 is an apocalyptic number.

It is an amenable number.

210409906673 is a deficient number, since it is larger than the sum of its proper divisors (1).

210409906673 is an equidigital number, since it uses as much as digits as its factorization.

210409906673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 210409906673 in words is "two hundred ten billion, four hundred nine million, nine hundred six thousand, six hundred seventy-three".