131221022130 has 48 divisors (see below), whose sum is σ = 372190538304. Its totient is φ = 31811156640.

The previous prime is 131221022083. The next prime is 131221022137. The reversal of 131221022130 is 31220122131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131221022137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66272254 + ... + 66274233.

It is an arithmetic number, because the mean of its divisors is an integer number (7753969548).

Almost surely, 2^131221022130 is an apocalyptic number.

131221022130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221022130 is an abundant number, since it is smaller than the sum of its proper divisors (240969516174).

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

131221022130 is a wasteful number, since it uses less digits than its factorization.

131221022130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132546511 (or 132546508 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 131221022130 its reverse (31220122131), we get a palindrome (162441144261).

The spelling of 131221022130 in words is "one hundred thirty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred thirty".