202121120220 has 144 divisors (see below), whose sum is σ = 614206714464. Its totient is φ = 49490739200.

The previous prime is 202121120189. The next prime is 202121120221. The reversal of 202121120220 is 22021121202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 202121120220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121120221) 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, 1655680 + ... + 1773560.

It is an arithmetic number, because the mean of its divisors is an integer number (4265324406).

Almost surely, 2^202121120220 is an apocalyptic number.

202121120220 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 202121120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307103357232).

202121120220 is an abundant number, since it is smaller than the sum of its proper divisors (412085594244).

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

202121120220 is a wasteful number, since it uses less digits than its factorization.

202121120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117992 (or 117949 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202121120220 its reverse (22021121202), we get a palindrome (224142241422).

The spelling of 202121120220 in words is "two hundred two billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty".