121212220201220 has 48 divisors (see below), whose sum is σ = 255209465916720. Its totient is φ = 48358487832576.

The previous prime is 121212220201217. The next prime is 121212220201231. The reversal of 121212220201220 is 22102022212121.

It can be written as a sum of positive squares in 8 ways, for example, as 14174200938496 + 107038019262724 = 3764864^2 + 10345918^2 .

It is a super-4 number, since 4×121212220201220⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121212220201192 and 121212220201201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49294904 + ... + 51695376.

It is an arithmetic number, because the mean of its divisors is an integer number (5316863873265).

Almost surely, 2^{121212220201220} is an apocalyptic number.

121212220201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212220201220 is an abundant number, since it is smaller than the sum of its proper divisors (133997245715500).

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

121212220201220 is a wasteful number, since it uses less digits than its factorization.

121212220201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407064 (or 2407062 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121212220201220 its reverse (22102022212121), we get a palindrome (143314242413341).

The spelling of 121212220201220 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred one thousand, two hundred twenty".