203112120042 has 24 divisors (see below), whose sum is σ = 473928280644. Its totient is φ = 62496036864.

The previous prime is 203112120041. The next prime is 203112120287. The reversal of 203112120042 is 240021211302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 203086323801 + 25796241 = 450651^2 + 5079^2 .

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 = 203112119997 and 203112120024.

It is not an unprimeable number, because it can be changed into a prime (203112120041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434000023 + ... + 434000490.

Almost surely, 2^203112120042 is an apocalyptic number.

203112120042 is an abundant number, since it is smaller than the sum of its proper divisors (270816160602).

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

203112120042 is a wasteful number, since it uses less digits than its factorization.

203112120042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868000534 (or 868000531 counting only the distinct ones).

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

Adding to 203112120042 its reverse (240021211302), we get a palindrome (443133331344).

The spelling of 203112120042 in words is "two hundred three billion, one hundred twelve million, one hundred twenty thousand, forty-two".