121451550220 has 288 divisors, whose sum is σ = 350731801728. Its totient is φ = 34366464000.

The previous prime is 121451550217. The next prime is 121451550257. The reversal of 121451550220 is 22055154121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13428900 + ... + 13437940.

It is an arithmetic number, because the mean of its divisors is an integer number (1217818756).

Almost surely, 2^121451550220 is an apocalyptic number.

121451550220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121451550220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175365900864).

121451550220 is an abundant number, since it is smaller than the sum of its proper divisors (229280251508).

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

121451550220 is a wasteful number, since it uses less digits than its factorization.

121451550220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9153 (or 9140 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 121451550220 in words is "one hundred twenty-one billion, four hundred fifty-one million, five hundred fifty thousand, two hundred twenty".