1213131132020 has 12 divisors (see below), whose sum is σ = 2547575377284. Its totient is φ = 485252452800.

The previous prime is 1213131131983. The next prime is 1213131132023. The reversal of 1213131132020 is 202311313121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 304304483044 + 908826648976 = 551638^2 + 953324^2 .

It is a super-2 number, since 2×1213131132020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 60656556601 = 1213131132020 / (1 + 2 + 1 + 3 + 1 + 3 + 1 + 1 + 3 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1213131131983 and 1213131132001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213131132023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30328278281 + ... + 30328278320.

It is an arithmetic number, because the mean of its divisors is an integer number (212297948107).

Almost surely, 2^{1213131132020} is an apocalyptic number.

1213131132020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213131132020 is an abundant number, since it is smaller than the sum of its proper divisors (1334444245264).

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

1213131132020 is a wasteful number, since it uses less digits than its factorization.

1213131132020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60656556610 (or 60656556608 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1213131132020 its reverse (202311313121), we get a palindrome (1415442445141).

The spelling of 1213131132020 in words is "one trillion, two hundred thirteen billion, one hundred thirty-one million, one hundred thirty-two thousand, twenty".