1211323213152 has 144 divisors (see below), whose sum is σ = 3927893860800. Its totient is φ = 350790414336.

The previous prime is 1211323213127. The next prime is 1211323213153. The reversal of 1211323213152 is 2513123231121.

1211323213152 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 323 + 21 + 315 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211323213153) 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 23 ways as a sum of consecutive naturals, for example, 9452152 + ... + 9579447.

It is an arithmetic number, because the mean of its divisors is an integer number (27277040700).

Almost surely, 2^{1211323213152} is an apocalyptic number.

1211323213152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211323213152 is an abundant number, since it is smaller than the sum of its proper divisors (2716570647648).

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

1211323213152 is a wasteful number, since it uses less digits than its factorization.

1211323213152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19031645 (or 19031634 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

Adding to 1211323213152 its reverse (2513123231121), we get a palindrome (3724446444273).

The spelling of 1211323213152 in words is "one trillion, two hundred eleven billion, three hundred twenty-three million, two hundred thirteen thousand, one hundred fifty-two".