1331244411100 has 72 divisors (see below), whose sum is σ = 2990534288000. Its totient is φ = 513843436800.

The previous prime is 1331244411047. The next prime is 1331244411109. The reversal of 1331244411100 is 11144421331.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331244411109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 466666 + ... + 1697134.

Almost surely, 2^{1331244411100} is an apocalyptic number.

1331244411100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331244411100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1495267144000).

1331244411100 is an abundant number, since it is smaller than the sum of its proper divisors (1659289876900).

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

1331244411100 is a wasteful number, since it uses less digits than its factorization.

1331244411100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230863 (or 1230856 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 1331244411100 its reverse (11144421331), we get a palindrome (1342388832431).

The spelling of 1331244411100 in words is "one trillion, three hundred thirty-one billion, two hundred forty-four million, four hundred eleven thousand, one hundred".