1243220311100 has 36 divisors (see below), whose sum is σ = 2790815256600. Its totient is φ = 480140256960.

The previous prime is 1243220311087. The next prime is 1243220311181. The reversal of 1243220311100 is 11130223421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214345430 + ... + 214351229.

Almost surely, 2^{1243220311100} is an apocalyptic number.

1243220311100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243220311100 is an abundant number, since it is smaller than the sum of its proper divisors (1547594945500).

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

1243220311100 is a wasteful number, since it uses less digits than its factorization.

1243220311100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428696702 (or 428696695 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1243220311100 its reverse (11130223421), we get a palindrome (1254350534521).

The spelling of 1243220311100 in words is "one trillion, two hundred forty-three billion, two hundred twenty million, three hundred eleven thousand, one hundred".