131223002220 has 72 divisors (see below), whose sum is σ = 398073521664. Its totient is φ = 34990126848.

The previous prime is 131223002203. The next prime is 131223002243. The reversal of 131223002220 is 22200322131.

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 = 131223002193 and 131223002202.

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, 3765717 + ... + 3800403.

It is an arithmetic number, because the mean of its divisors is an integer number (5528798912).

Almost surely, 2^131223002220 is an apocalyptic number.

131223002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131223002220 is an abundant number, since it is smaller than the sum of its proper divisors (266850519444).

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

131223002220 is a wasteful number, since it uses less digits than its factorization.

131223002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55719 (or 55714 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 131223002220 its reverse (22200322131), we get a palindrome (153423324351).

The spelling of 131223002220 in words is "one hundred thirty-one billion, two hundred twenty-three million, two thousand, two hundred twenty".