121220221120 has 56 divisors (see below), whose sum is σ = 288837617904. Its totient is φ = 48457522176.

The previous prime is 121220221091. The next prime is 121220221147. The reversal of 121220221120 is 21122022121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 121220221094 and 121220221103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392439 + ... + 629641.

Almost surely, 2^121220221120 is an apocalyptic number.

121220221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220221120 is an abundant number, since it is smaller than the sum of its proper divisors (167617396784).

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

121220221120 is a wasteful number, since it uses less digits than its factorization.

121220221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238817 (or 238807 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121220221120 its reverse (21122022121), we get a palindrome (142342243241).

The spelling of 121220221120 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred twenty".