212121101112220 has 24 divisors (see below), whose sum is σ = 445455848476800. Its totient is φ = 84848147846592.

The previous prime is 212121101112209. The next prime is 212121101112223. The reversal of 212121101112220 is 22211101121212.

It is a happy number.

It is a super-3 number, since 3×212121101112220³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121101112223) 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, 12294855 + ... + 23987614.

It is an arithmetic number, because the mean of its divisors is an integer number (18560660353200).

Almost surely, 2^{212121101112220} is an apocalyptic number.

212121101112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121101112220 is an abundant number, since it is smaller than the sum of its proper divisors (233334747364580).

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

212121101112220 is a wasteful number, since it uses less digits than its factorization.

212121101112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36574797 (or 36574795 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212121101112220 its reverse (22211101121212), we get a palindrome (234332202233432).

The spelling of 212121101112220 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred one million, one hundred twelve thousand, two hundred twenty".