203111204040 has 192 divisors, whose sum is σ = 668939731200. Its totient is φ = 53441203200.

The previous prime is 203111204029. The next prime is 203111204041. The reversal of 203111204040 is 40402111302.

It is a super-2 number, since 2×203111204040² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (203111204041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15725185 + ... + 15738095.

It is an arithmetic number, because the mean of its divisors is an integer number (3484061100).

Almost surely, 2^203111204040 is an apocalyptic number.

203111204040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203111204040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334469865600).

203111204040 is an abundant number, since it is smaller than the sum of its proper divisors (465828527160).

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

203111204040 is a wasteful number, since it uses less digits than its factorization.

203111204040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13508 (or 13501 counting only the distinct ones).

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

Adding to 203111204040 its reverse (40402111302), we get a palindrome (243513315342).

The spelling of 203111204040 in words is "two hundred three billion, one hundred eleven million, two hundred four thousand, forty".