121212112211220 has 48 divisors (see below), whose sum is σ = 339613019625600. Its totient is φ = 32302362738816.

The previous prime is 121212112211137. The next prime is 121212112211227. The reversal of 121212112211220 is 22112211212121.

121212112211220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×121212112211220² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212112211227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652005792 + ... + 652191671.

It is an arithmetic number, because the mean of its divisors is an integer number (7075271242200).

Almost surely, 2^{121212112211220} is an apocalyptic number.

121212112211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212112211220 is an abundant number, since it is smaller than the sum of its proper divisors (218400907414380).

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

121212112211220 is a wasteful number, since it uses less digits than its factorization.

121212112211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304199024 (or 1304199022 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121212112211220 its reverse (22112211212121), we get a palindrome (143324323423341).

Subtracting from 121212112211220 its reverse (22112211212121), we obtain a palindrome (99099900999099).

The spelling of 121212112211220 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty".