121220111155472 has 320 divisors, whose sum is σ = 289961441280000. Its totient is φ = 47942439874560.

The previous prime is 121220111155471. The next prime is 121220111155547. The reversal of 121220111155472 is 274551111022121.

It is not an unprimeable number, because it can be changed into a prime (121220111155471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24056379929 + ... + 24056384967.

It is an arithmetic number, because the mean of its divisors is an integer number (906129504000).

Almost surely, 2^{121220111155472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220111155472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144980720640000).

121220111155472 is an abundant number, since it is smaller than the sum of its proper divisors (168741330124528).

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

121220111155472 is a wasteful number, since it uses less digits than its factorization.

121220111155472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022 (or 7016 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 35.

Adding to 121220111155472 its reverse (274551111022121), we get a palindrome (395771222177593).

The spelling of 121220111155472 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred fifty-five thousand, four hundred seventy-two".