1211212120985 has 16 divisors (see below), whose sum is σ = 1458922080000. Its totient is φ = 965327849856.

The previous prime is 1211212120969. The next prime is 1211212121023. The reversal of 1211212120985 is 5890212121121.

It is a cyclic number.

It is not a de Polignac number, because 1211212120985 - 2⁴ = 1211212120969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2871101 + ... + 3265829.

It is an arithmetic number, because the mean of its divisors is an integer number (91182630000).

Almost surely, 2^{1211212120985} is an apocalyptic number.

It is an amenable number.

1211212120985 is a deficient number, since it is larger than the sum of its proper divisors (247709959015).

1211212120985 is a wasteful number, since it uses less digits than its factorization.

1211212120985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397040.

The product of its (nonzero) digits is 5760, while the sum is 35.

The spelling of 1211212120985 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty thousand, nine hundred eighty-five".