1131243020420 has 24 divisors (see below), whose sum is σ = 2375846138904. Its totient is φ = 452452294656.

The previous prime is 1131243020399. The next prime is 1131243020429. The reversal of 1131243020420 is 240203421311.

It can be written as a sum of positive squares in 4 ways, for example, as 383530012804 + 747713007616 = 619298^2 + 864704^2 .

It is not an unprimeable number, because it can be changed into a prime (1131243020429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2600189 + ... + 3003908.

It is an arithmetic number, because the mean of its divisors is an integer number (98993589121).

Almost surely, 2^{1131243020420} is an apocalyptic number.

1131243020420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131243020420 is an abundant number, since it is smaller than the sum of its proper divisors (1244603118484).

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

1131243020420 is a wasteful number, since it uses less digits than its factorization.

1131243020420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614199 (or 5614197 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1131243020420 its reverse (240203421311), we get a palindrome (1371446441731).

The spelling of 1131243020420 in words is "one trillion, one hundred thirty-one billion, two hundred forty-three million, twenty thousand, four hundred twenty".