202121112220 has 12 divisors (see below), whose sum is σ = 424454335704. Its totient is φ = 80848444880.

The previous prime is 202121112173. The next prime is 202121112253. The reversal of 202121112220 is 22211121202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 202121112194 and 202121112203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5053027786 + ... + 5053027825.

It is an arithmetic number, because the mean of its divisors is an integer number (35371194642).

Almost surely, 2^202121112220 is an apocalyptic number.

202121112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121112220 is an abundant number, since it is smaller than the sum of its proper divisors (222333223484).

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

202121112220 is a wasteful number, since it uses less digits than its factorization.

202121112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106055620 (or 10106055618 counting only the distinct ones).

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

Adding to 202121112220 its reverse (22211121202), we get a palindrome (224332233422).

The spelling of 202121112220 in words is "two hundred two billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twenty".