203122111220 has 96 divisors (see below), whose sum is σ = 510148800000. Its totient is φ = 66422721024.

The previous prime is 203122111183. The next prime is 203122111223. The reversal of 203122111220 is 22111221302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203122111223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1033406 + ... + 1214154.

It is an arithmetic number, because the mean of its divisors is an integer number (5314050000).

Almost surely, 2^203122111220 is an apocalyptic number.

203122111220 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 203122111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255074400000).

203122111220 is an abundant number, since it is smaller than the sum of its proper divisors (307026688780).

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

203122111220 is a wasteful number, since it uses less digits than its factorization.

203122111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181137 (or 181135 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 203122111220 its reverse (22111221302), we get a palindrome (225233332522).

The spelling of 203122111220 in words is "two hundred three billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty".