121220212220220 has 24 divisors (see below), whose sum is σ = 339416594216784. Its totient is φ = 32325389925376.

The previous prime is 121220212220183. The next prime is 121220212220221. The reversal of 121220212220220 is 22022212022121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220212220221) 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, 1010168435109 + ... + 1010168435228.

It is an arithmetic number, because the mean of its divisors is an integer number (14142358092366).

Almost surely, 2^{121220212220220} is an apocalyptic number.

121220212220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220212220220 is an abundant number, since it is smaller than the sum of its proper divisors (218196381996564).

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

121220212220220 is a wasteful number, since it uses less digits than its factorization.

121220212220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020336870349 (or 2020336870347 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 121220212220220 its reverse (22022212022121), we get a palindrome (143242424242341).

The spelling of 121220212220220 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty".