121899530880 has 1024 divisors, whose sum is σ = 476948736000. Its totient is φ = 29668737024.

The previous prime is 121899530843. The next prime is 121899530887. The reversal of 121899530880 is 88035998121.

121899530880 is a `hidden beast` number, since 1 + 2 + 18 + 99 + 530 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (121899530887) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1118344266 + ... + 1118344374.

It is an arithmetic number, because the mean of its divisors is an integer number (465770250).

Almost surely, 2^121899530880 is an apocalyptic number.

121899530880 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 121899530880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238474368000).

121899530880 is an abundant number, since it is smaller than the sum of its proper divisors (355049205120).

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

121899530880 is an equidigital number, since it uses as much as digits as its factorization.

121899530880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 121899530880 in words is "one hundred twenty-one billion, eight hundred ninety-nine million, five hundred thirty thousand, eight hundred eighty".