202121100210220 has 24 divisors (see below), whose sum is σ = 428575226081184. Its totient is φ = 80063503771776.

The previous prime is 202121100210199. The next prime is 202121100210223. The reversal of 202121100210220 is 22012001121202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 202121100210194 and 202121100210203.

It is not an unprimeable number, because it can be changed into a prime (202121100210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49058517409 + ... + 49058521528.

It is an arithmetic number, because the mean of its divisors is an integer number (17857301086716).

Almost surely, 2^{202121100210220} is an apocalyptic number.

202121100210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121100210220 is an abundant number, since it is smaller than the sum of its proper divisors (226454125870964).

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

202121100210220 is a wasteful number, since it uses less digits than its factorization.

202121100210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98117039049 (or 98117039047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202121100210220 its reverse (22012001121202), we get a palindrome (224133101331422).

The spelling of 202121100210220 in words is "two hundred two trillion, one hundred twenty-one billion, one hundred million, two hundred ten thousand, two hundred twenty".