1212211110209 has 8 divisors (see below), whose sum is σ = 1322482541760. Its totient is φ = 1101951415600.

The previous prime is 1212211110139. The next prime is 1212211110259. The reversal of 1212211110209 is 9020111122121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212211110209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212211110259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2717582 + ... + 3132039.

It is an arithmetic number, because the mean of its divisors is an integer number (165310317720).

Almost surely, 2^{1212211110209} is an apocalyptic number.

It is an amenable number.

1212211110209 is a deficient number, since it is larger than the sum of its proper divisors (110271431551).

1212211110209 is a wasteful number, since it uses less digits than its factorization.

1212211110209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868471.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1212211110209 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred ten thousand, two hundred nine".