1211205135344 has 40 divisors (see below), whose sum is σ = 2360175077520. Its totient is φ = 602128716800.

The previous prime is 1211205135323. The next prime is 1211205135379. The reversal of 1211205135344 is 4435315021121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211205135344.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21569384 + ... + 21625464.

It is an arithmetic number, because the mean of its divisors is an integer number (59004376938).

Almost surely, 2^{1211205135344} is an apocalyptic number.

It is an amenable number.

1211205135344 is a deficient number, since it is larger than the sum of its proper divisors (1148969942176).

1211205135344 is a wasteful number, since it uses less digits than its factorization.

1211205135344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63809 (or 63803 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 1211205135344 in words is "one trillion, two hundred eleven billion, two hundred five million, one hundred thirty-five thousand, three hundred forty-four".