202123545220 has 48 divisors (see below), whose sum is σ = 432455971248. Its totient is φ = 79340441600.

The previous prime is 202123545187. The next prime is 202123545257. The reversal of 202123545220 is 22545321202.

It can be written as a sum of positive squares in 8 ways, for example, as 15912308736 + 186211236484 = 126144^2 + 431522^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214489 + ... + 671008.

It is an arithmetic number, because the mean of its divisors is an integer number (9009499401).

Almost surely, 2^202123545220 is an apocalyptic number.

202123545220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202123545220 is an abundant number, since it is smaller than the sum of its proper divisors (230332426028).

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

202123545220 is a wasteful number, since it uses less digits than its factorization.

202123545220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885720 (or 885718 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 202123545220 its reverse (22545321202), we get a palindrome (224668866422).

The spelling of 202123545220 in words is "two hundred two billion, one hundred twenty-three million, five hundred forty-five thousand, two hundred twenty".