121121012021220 has 144 divisors (see below), whose sum is σ = 386741946689280. Its totient is φ = 30598622208000.

The previous prime is 121121012021117. The next prime is 121121012021279. The reversal of 121121012021220 is 22120210121121.

121121012021220 is a `hidden beast` number, since 1 + 211 + 210 + 1 + 2 + 0 + 21 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121121012021193 and 121121012021202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 382166820 + ... + 382483620.

It is an arithmetic number, because the mean of its divisors is an integer number (2685707963120).

Almost surely, 2^{121121012021220} is an apocalyptic number.

121121012021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121012021220 is an abundant number, since it is smaller than the sum of its proper divisors (265620934668060).

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

121121012021220 is a wasteful number, since it uses less digits than its factorization.

121121012021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428626 (or 428621 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121121012021220 its reverse (22120210121121), we get a palindrome (143241222142341).

The spelling of 121121012021220 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twelve million, twenty-one thousand, two hundred twenty".