1331220013131 has 4 divisors (see below), whose sum is σ = 1774960017512. Its totient is φ = 887480008752.

The previous prime is 1331220013121. The next prime is 1331220013181. The reversal of 1331220013131 is 1313100221331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1331220013131 - 2⁷ = 1331220013003 is a prime.

It is a super-2 number, since 2×1331220013131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331220013098 and 1331220013107.

It is not an unprimeable number, because it can be changed into a prime (1331220013121) 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, 221870002186 + ... + 221870002191.

It is an arithmetic number, because the mean of its divisors is an integer number (443740004378).

Almost surely, 2^{1331220013131} is an apocalyptic number.

1331220013131 is a deficient number, since it is larger than the sum of its proper divisors (443740004381).

1331220013131 is an equidigital number, since it uses as much as digits as its factorization.

1331220013131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443740004380.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1331220013131 its reverse (1313100221331), we get a palindrome (2644320234462).

The spelling of 1331220013131 in words is "one trillion, three hundred thirty-one billion, two hundred twenty million, thirteen thousand, one hundred thirty-one".