1318021761100 has 72 divisors (see below), whose sum is σ = 3124634135616. Its totient is φ = 478586760000.

The previous prime is 1318021761053. The next prime is 1318021761113. The reversal of 1318021761100 is 11671208131.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106906 + ... + 1627105.

It is an arithmetic number, because the mean of its divisors is an integer number (43397696328).

Almost surely, 2^{1318021761100} is an apocalyptic number.

1318021761100 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 1318021761100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562317067808).

1318021761100 is an abundant number, since it is smaller than the sum of its proper divisors (1806612374516).

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

1318021761100 is a wasteful number, since it uses less digits than its factorization.

1318021761100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734727 (or 1734720 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

Adding to 1318021761100 its reverse (11671208131), we get a palindrome (1329692969231).

The spelling of 1318021761100 in words is "one trillion, three hundred eighteen billion, twenty-one million, seven hundred sixty-one thousand, one hundred".