121221112220120 has 48 divisors (see below), whose sum is σ = 299796841597680. Its totient is φ = 44080404441920.

The previous prime is 121221112220113. The next prime is 121221112220191. The reversal of 121221112220120 is 21022211122121.

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 = 121221112220092 and 121221112220101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12522837332 + ... + 12522847011.

It is an arithmetic number, because the mean of its divisors is an integer number (6245767533285).

Almost surely, 2^{121221112220120} is an apocalyptic number.

121221112220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221112220120 is an abundant number, since it is smaller than the sum of its proper divisors (178575729377560).

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

121221112220120 is a wasteful number, since it uses less digits than its factorization.

121221112220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25045684376 (or 25045684361 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121221112220120 its reverse (21022211122121), we get a palindrome (142243323342241).

The spelling of 121221112220120 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred twenty".