1211209999999 has 8 divisors (see below), whose sum is σ = 1213085552000. Its totient is φ = 1209335767200.

The previous prime is 1211209999921. The next prime is 1211210000069. The reversal of 1211209999999 is 9999999021121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211209999999 - 2³¹ = 1209062516351 is a prime.

It is a Duffinian number.

1211209999999 is a modest number, since divided by 9999999 gives 121120 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211209999399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515877 + ... + 2172625.

It is an arithmetic number, because the mean of its divisors is an integer number (151635694000).

Almost surely, 2^{1211209999999} is an apocalyptic number.

1211209999999 is a deficient number, since it is larger than the sum of its proper divisors (1875552001).

1211209999999 is an equidigital number, since it uses as much as digits as its factorization.

1211209999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659601.

The product of its (nonzero) digits is 19131876, while the sum is 70.

The spelling of 1211209999999 in words is "one trillion, two hundred eleven billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".