121229521568 has 48 divisors (see below), whose sum is σ = 247279334400. Its totient is φ = 58442860800.

The previous prime is 121229521547. The next prime is 121229521571. The reversal of 121229521568 is 865125922121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43358 + ... + 494306.

It is an arithmetic number, because the mean of its divisors is an integer number (5151652800).

Almost surely, 2^121229521568 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 121229521568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123639667200).

121229521568 is an abundant number, since it is smaller than the sum of its proper divisors (126049812832).

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

121229521568 is a wasteful number, since it uses less digits than its factorization.

121229521568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451261 (or 451253 counting only the distinct ones).

The product of its digits is 172800, while the sum is 44.

The spelling of 121229521568 in words is "one hundred twenty-one billion, two hundred twenty-nine million, five hundred twenty-one thousand, five hundred sixty-eight".