1211321340240 has 80 divisors (see below), whose sum is σ = 4096468541376. Its totient is φ = 293653657600.

The previous prime is 1211321340169. The next prime is 1211321340259. The reversal of 1211321340240 is 420431231121.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1211321340240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229414281 + ... + 229419560.

Almost surely, 2^{1211321340240} is an apocalyptic number.

1211321340240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211321340240 is an abundant number, since it is smaller than the sum of its proper divisors (2885147201136).

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

1211321340240 is a wasteful number, since it uses less digits than its factorization.

1211321340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458833868 (or 458833862 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 1211321340240 its reverse (420431231121), we get a palindrome (1631752571361).

The spelling of 1211321340240 in words is "one trillion, two hundred eleven billion, three hundred twenty-one million, three hundred forty thousand, two hundred forty".