1211979035904 has 288 divisors, whose sum is σ = 3994401675264. Its totient is φ = 317678837760.

The previous prime is 1211979035903. The next prime is 1211979035933. The reversal of 1211979035904 is 4095309791121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211979035903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11338549 + ... + 11444939.

Almost surely, 2^{1211979035904} is an apocalyptic number.

1211979035904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211979035904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1997200837632).

1211979035904 is an abundant number, since it is smaller than the sum of its proper divisors (2782422639360).

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

1211979035904 is a wasteful number, since it uses less digits than its factorization.

1211979035904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106593 (or 106579 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 51.

The spelling of 1211979035904 in words is "one trillion, two hundred eleven billion, nine hundred seventy-nine million, thirty-five thousand, nine hundred four".