121121021212220 has 48 divisors (see below), whose sum is σ = 269369773440768. Its totient is φ = 45589423518720.

The previous prime is 121121021212183. The next prime is 121121021212241. The reversal of 121121021212220 is 22212120121121.

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 = 121121021212192 and 121121021212201.

It is a congruent number.

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, 33752891 + ... + 37168530.

It is an arithmetic number, because the mean of its divisors is an integer number (5611870280016).

Almost surely, 2^{121121021212220} is an apocalyptic number.

121121021212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121021212220 is an abundant number, since it is smaller than the sum of its proper divisors (148248752228548).

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

121121021212220 is a wasteful number, since it uses less digits than its factorization.

121121021212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70926470 (or 70926468 counting only the distinct ones).

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

Adding to 121121021212220 its reverse (22212120121121), we get a palindrome (143333141333341).

The spelling of 121121021212220 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred twelve thousand, two hundred twenty".