121211101220 has 24 divisors (see below), whose sum is σ = 277683614208. Its totient is φ = 44076764000.

The previous prime is 121211101201. The next prime is 121211101259. The reversal of 121211101220 is 22101112121.

121211101220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 121211101195 and 121211101204.

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, 275479556 + ... + 275479995.

It is an arithmetic number, because the mean of its divisors is an integer number (11570150592).

Almost surely, 2^121211101220 is an apocalyptic number.

121211101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211101220 is an abundant number, since it is smaller than the sum of its proper divisors (156472512988).

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

121211101220 is a wasteful number, since it uses less digits than its factorization.

121211101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550959571 (or 550959569 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121211101220 its reverse (22101112121), we get a palindrome (143312213341).

The spelling of 121211101220 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred one thousand, two hundred twenty".