1211209999912 has 48 divisors (see below), whose sum is σ = 2589874721280. Its totient is φ = 526613023200.

The previous prime is 1211209999903. The next prime is 1211209999913. The reversal of 1211209999912 is 2199999021121.

It is not an unprimeable number, because it can be changed into a prime (1211209999913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12962664 + ... + 13055767.

It is an arithmetic number, because the mean of its divisors is an integer number (53955723360).

Almost surely, 2^{1211209999912} is an apocalyptic number.

It is an amenable number.

1211209999912 is an abundant number, since it is smaller than the sum of its proper divisors (1378664721368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211209999912 is a wasteful number, since it uses less digits than its factorization.

1211209999912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26018494 (or 26018467 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 55.

The spelling of 1211209999912 in words is "one trillion, two hundred eleven billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred twelve".