121017540 has 48 divisors (see below), whose sum is σ = 387257472. Its totient is φ = 27661056.

The previous prime is 121017539. The next prime is 121017541. The reversal of 121017540 is 45710121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121017539) and next prime (121017541).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (121017541) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 143649 + ... + 144488.

It is an arithmetic number, because the mean of its divisors is an integer number (8067864).

Almost surely, 2^121017540 is an apocalyptic number.

121017540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121017540 is an abundant number, since it is smaller than the sum of its proper divisors (266239932).

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

121017540 is a wasteful number, since it uses less digits than its factorization.

121017540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288156 (or 288154 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 121017540 is about 11000.7972438365. The cubic root of 121017540 is about 494.6326424467.

Adding to 121017540 its reverse (45710121), we get a palindrome (166727661).

The spelling of 121017540 in words is "one hundred twenty-one million, seventeen thousand, five hundred forty".