121038391540 has 48 divisors (see below), whose sum is σ = 291882064320. Its totient is φ = 41697434880.

The previous prime is 121038391447. The next prime is 121038391571. The reversal of 121038391540 is 45193830121.

It is a self number, because there is not a number n which added to its sum of digits gives 121038391540.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 14474097 + ... + 14482456.

It is an arithmetic number, because the mean of its divisors is an integer number (6080876340).

Almost surely, 2^121038391540 is an apocalyptic number.

121038391540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121038391540 is an abundant number, since it is smaller than the sum of its proper divisors (170843672780).

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

121038391540 is a wasteful number, since it uses less digits than its factorization.

121038391540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28956592 (or 28956590 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

It can be divided in two parts, 121038 and 391540, that added together give a triangular number (512578 = T₁₀₁₂).

The spelling of 121038391540 in words is "one hundred twenty-one billion, thirty-eight million, three hundred ninety-one thousand, five hundred forty".