131220111020 has 48 divisors (see below), whose sum is σ = 294660682848. Its totient is φ = 48911385600.

The previous prime is 131220110999. The next prime is 131220111023. The reversal of 131220111020 is 20111022131.

It is a super-2 number, since 2×131220111020² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131220110986 and 131220111004.

It is not an unprimeable number, because it can be changed into a prime (131220111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1876262 + ... + 1944941.

It is an arithmetic number, because the mean of its divisors is an integer number (6138764226).

Almost surely, 2^131220111020 is an apocalyptic number.

131220111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131220111020 is an abundant number, since it is smaller than the sum of its proper divisors (163440571828).

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

131220111020 is a wasteful number, since it uses less digits than its factorization.

131220111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821330 (or 3821328 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 131220111020 its reverse (20111022131), we get a palindrome (151331133151).

The spelling of 131220111020 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred eleven thousand, twenty".