212121000220 has 24 divisors (see below), whose sum is σ = 447762160944. Its totient is φ = 84408769536.

The previous prime is 212121000199. The next prime is 212121000229. The reversal of 212121000220 is 22000121212.

It is a happy number.

It is a super-3 number, since 3×212121000220³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212121000220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121000229) 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, 27472954 + ... + 27480673.

It is an arithmetic number, because the mean of its divisors is an integer number (18656756706).

Almost surely, 2^212121000220 is an apocalyptic number.

212121000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121000220 is an abundant number, since it is smaller than the sum of its proper divisors (235641160724).

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

212121000220 is a wasteful number, since it uses less digits than its factorization.

212121000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54953829 (or 54953827 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212121000220 its reverse (22000121212), we get a palindrome (234121121432).

The spelling of 212121000220 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty", and thus it is an aban number.