203131120212 has 72 divisors (see below), whose sum is σ = 527529311400. Its totient is φ = 65857701888.

The previous prime is 203131120207. The next prime is 203131120219. The reversal of 203131120212 is 212021131302.

203131120212 is a `hidden beast` number, since 20 + 313 + 1 + 120 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 82440191376 + 120690928836 = 287124^2 + 347406^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203131120219) 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, 4089864 + ... + 4139232.

Almost surely, 2^203131120212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203131120212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263764655700).

203131120212 is an abundant number, since it is smaller than the sum of its proper divisors (324398191188).

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

203131120212 is a wasteful number, since it uses less digits than its factorization.

203131120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52505 (or 52500 counting only the distinct ones).

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

Adding to 203131120212 its reverse (212021131302), we get a palindrome (415152251514).

The spelling of 203131120212 in words is "two hundred three billion, one hundred thirty-one million, one hundred twenty thousand, two hundred twelve".