121398722121600 has 2304 divisors, whose sum is σ = 550755787944960. Its totient is φ = 24729255936000.

The previous prime is 121398722121583. The next prime is 121398722121601. The reversal of 121398722121600 is 6121227893121.

121398722121600 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 9 + 8 + 7 + 22 + 12 + 1 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121398722121601) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 45587201869 + ... + 45587204531.

It is an arithmetic number, because the mean of its divisors is an integer number (239043310740).

Almost surely, 2^{121398722121600} is an apocalyptic number.

121398722121600 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 121398722121600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275377893972480).

121398722121600 is an abundant number, since it is smaller than the sum of its proper divisors (429357065823360).

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

121398722121600 is a wasteful number, since it uses less digits than its factorization.

121398722121600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109 (or 3089 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 121398722121600 in words is "one hundred twenty-one trillion, three hundred ninety-eight billion, seven hundred twenty-two million, one hundred twenty-one thousand, six hundred".