121638574080 has 432 divisors, whose sum is σ = 447932918160. Its totient is φ = 30522212352.

The previous prime is 121638574067. The next prime is 121638574133. The reversal of 121638574080 is 80475836121.

121638574080 is a `hidden beast` number, since 1 + 2 + 1 + 638 + 5 + 7 + 4 + 0 + 8 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26631957 + ... + 26636523.

It is an arithmetic number, because the mean of its divisors is an integer number (1036881755).

Almost surely, 2^121638574080 is an apocalyptic number.

121638574080 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 121638574080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223966459080).

121638574080 is an abundant number, since it is smaller than the sum of its proper divisors (326294344080).

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

121638574080 is a wasteful number, since it uses less digits than its factorization.

121638574080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4634 (or 4594 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 121638574080 in words is "one hundred twenty-one billion, six hundred thirty-eight million, five hundred seventy-four thousand, eighty".