212121202220 has 48 divisors (see below), whose sum is σ = 448402801728. Its totient is φ = 84287174400.

The previous prime is 212121202193. The next prime is 212121202297. The reversal of 212121202220 is 22202121212.

It is a happy number.

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, 21419270 + ... + 21429170.

It is an arithmetic number, because the mean of its divisors is an integer number (9341725036).

Almost surely, 2^212121202220 is an apocalyptic number.

212121202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121202220 is an abundant number, since it is smaller than the sum of its proper divisors (236281599508).

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

212121202220 is a wasteful number, since it uses less digits than its factorization.

212121202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16890 (or 16888 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212121202220 its reverse (22202121212), we get a palindrome (234323323432).

The spelling of 212121202220 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty".