121213201220 has 48 divisors (see below), whose sum is σ = 255987623808. Its totient is φ = 48211549440.

The previous prime is 121213201189. The next prime is 121213201231. The reversal of 121213201220 is 22102312121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3720200 + ... + 3752640.

It is an arithmetic number, because the mean of its divisors is an integer number (5333075496).

Almost surely, 2^121213201220 is an apocalyptic number.

121213201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121213201220 is an abundant number, since it is smaller than the sum of its proper divisors (134774422588).

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

121213201220 is a wasteful number, since it uses less digits than its factorization.

121213201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33500 (or 33498 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121213201220 its reverse (22102312121), we get a palindrome (143315513341).

The spelling of 121213201220 in words is "one hundred twenty-one billion, two hundred thirteen million, two hundred one thousand, two hundred twenty".