212121132220 has 24 divisors (see below), whose sum is σ = 471657577104. Its totient is φ = 79857367296.

The previous prime is 212121132199. The next prime is 212121132343. The reversal of 212121132220 is 22231121212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311942502 + ... + 311943181.

It is an arithmetic number, because the mean of its divisors is an integer number (19652399046).

Almost surely, 2^212121132220 is an apocalyptic number.

212121132220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121132220 is an abundant number, since it is smaller than the sum of its proper divisors (259536444884).

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

212121132220 is a wasteful number, since it uses less digits than its factorization.

212121132220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623885709 (or 623885707 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 212121132220 its reverse (22231121212), we get a palindrome (234352253432).

The spelling of 212121132220 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty".