1211331113020 has 96 divisors (see below), whose sum is σ = 3031124705280. Its totient is φ = 397834778880.

The previous prime is 1211331113011. The next prime is 1211331113051. The reversal of 1211331113020 is 203111331121.

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 31 ways as a sum of consecutive naturals, for example, 659016 + ... + 1690255.

It is an arithmetic number, because the mean of its divisors is an integer number (31574215680).

Almost surely, 2^{1211331113020} is an apocalyptic number.

1211331113020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211331113020 is an abundant number, since it is smaller than the sum of its proper divisors (1819793592260).

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

1211331113020 is a wasteful number, since it uses less digits than its factorization.

1211331113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349443 (or 2349441 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1211331113020 its reverse (203111331121), we get a palindrome (1414442444141).

The spelling of 1211331113020 in words is "one trillion, two hundred eleven billion, three hundred thirty-one million, one hundred thirteen thousand, twenty".