121988650474878 has 32 divisors (see below), whose sum is σ = 266157900508032. Its totient is φ = 36966140368800.

The previous prime is 121988650474877. The next prime is 121988650474909. The reversal of 121988650474878 is 878474056889121.

It is a super-2 number, since 2×121988650474878² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121988650474877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19278625 + ... + 24812147.

It is an arithmetic number, because the mean of its divisors is an integer number (8317434390876).

Almost surely, 2^{121988650474878} is an apocalyptic number.

121988650474878 is an abundant number, since it is smaller than the sum of its proper divisors (144169250033154).

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

121988650474878 is a wasteful number, since it uses less digits than its factorization.

121988650474878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5867560.

The product of its (nonzero) digits is 1734082560, while the sum is 78.

The spelling of 121988650474878 in words is "one hundred twenty-one trillion, nine hundred eighty-eight billion, six hundred fifty million, four hundred seventy-four thousand, eight hundred seventy-eight".