131012222220 has 72 divisors (see below), whose sum is σ = 433531360080. Its totient is φ = 31760538240.

The previous prime is 131012222149. The next prime is 131012222233. The reversal of 131012222220 is 22222210131.

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

It is a junction number, because it is equal to n+sod(n) for n = 131012222193 and 131012222202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33081915 + ... + 33085874.

It is an arithmetic number, because the mean of its divisors is an integer number (6021268890).

Almost surely, 2^131012222220 is an apocalyptic number.

131012222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131012222220 is an abundant number, since it is smaller than the sum of its proper divisors (302519137860).

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

131012222220 is a wasteful number, since it uses less digits than its factorization.

131012222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66167815 (or 66167810 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 131012222220 its reverse (22222210131), we get a palindrome (153234432351).

The spelling of 131012222220 in words is "one hundred thirty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty".