1211343212240 has 80 divisors (see below), whose sum is σ = 3220444295040. Its totient is φ = 415094146560.

The previous prime is 1211343212237. The next prime is 1211343212249. The reversal of 1211343212240 is 422123431121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211343212249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460991 + ... + 1623329.

It is an arithmetic number, because the mean of its divisors is an integer number (40255553688).

Almost surely, 2^{1211343212240} is an apocalyptic number.

1211343212240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211343212240 is an abundant number, since it is smaller than the sum of its proper divisors (2009101082800).

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

1211343212240 is a wasteful number, since it uses less digits than its factorization.

1211343212240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164220 (or 1164214 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1211343212240 its reverse (422123431121), we get a palindrome (1633466643361).

The spelling of 1211343212240 in words is "one trillion, two hundred eleven billion, three hundred forty-three million, two hundred twelve thousand, two hundred forty".