210440340209999 has 2 divisors, whose sum is σ = 210440340210000. Its totient is φ = 210440340209998.

The previous prime is 210440340209927. The next prime is 210440340210011. The reversal of 210440340209999 is 999902043044012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210440340209999 - 2¹² = 210440340205903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210440340209399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105220170104999 + 105220170105000.

It is an arithmetic number, because the mean of its divisors is an integer number (105220170105000).

Almost surely, 2^{210440340209999} is an apocalyptic number.

210440340209999 is a deficient number, since it is larger than the sum of its proper divisors (1).

210440340209999 is an equidigital number, since it uses as much as digits as its factorization.

210440340209999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 56.

The spelling of 210440340209999 in words is "two hundred ten trillion, four hundred forty billion, three hundred forty million, two hundred nine thousand, nine hundred ninety-nine".