121213131220 has 24 divisors (see below), whose sum is σ = 265614862464. Its totient is φ = 46377197856.

The previous prime is 121213131203. The next prime is 121213131233. The reversal of 121213131220 is 22131312121.

121213131220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 131752944 + ... + 131753863.

It is an arithmetic number, because the mean of its divisors is an integer number (11067285936).

Almost surely, 2^121213131220 is an apocalyptic number.

121213131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121213131220 is an abundant number, since it is smaller than the sum of its proper divisors (144401731244).

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

121213131220 is a wasteful number, since it uses less digits than its factorization.

121213131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263506839 (or 263506837 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121213131220 its reverse (22131312121), we get a palindrome (143344443341).

The spelling of 121213131220 in words is "one hundred twenty-one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred twenty".