1211946218406 has 192 divisors, whose sum is σ = 3597615648000. Its totient is φ = 298223130240.

The previous prime is 1211946218333. The next prime is 1211946218423. The reversal of 1211946218406 is 6048126491121.

1211946218406 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 9 + 462 + 184 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 542751 + ... + 1648778.

It is an arithmetic number, because the mean of its divisors is an integer number (18737581500).

Almost surely, 2^{1211946218406} is an apocalyptic number.

1211946218406 is an abundant number, since it is smaller than the sum of its proper divisors (2385669429594).

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

1211946218406 is a wasteful number, since it uses less digits than its factorization.

1211946218406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191584 (or 2191571 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 1211946218406 in words is "one trillion, two hundred eleven billion, nine hundred forty-six million, two hundred eighteen thousand, four hundred six".