1212202110209 has 2 divisors, whose sum is σ = 1212202110210. Its totient is φ = 1212202110208.

The previous prime is 1212202110101. The next prime is 1212202110221. The reversal of 1212202110209 is 9020112022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1205428326400 + 6773783809 = 1097920^2 + 82303^2 .

It is an emirp because it is prime and its reverse (9020112022121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212202110209 - 2²⁴ = 1212185332993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212202110269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606101055104 + 606101055105.

It is an arithmetic number, because the mean of its divisors is an integer number (606101055105).

Almost surely, 2^{1212202110209} is an apocalyptic number.

It is an amenable number.

1212202110209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212202110209 is an equidigital number, since it uses as much as digits as its factorization.

1212202110209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1212202110209 in words is "one trillion, two hundred twelve billion, two hundred two million, one hundred ten thousand, two hundred nine".