121540870 has 24 divisors (see below), whose sum is σ = 240472512. Its totient is φ = 44196240.

The previous prime is 121540849. The next prime is 121540877. The reversal of 121540870 is 78045121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540877) 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 11 ways as a sum of consecutive naturals, for example, 49014 + ... + 51433.

It is an arithmetic number, because the mean of its divisors is an integer number (10019688).

Almost surely, 2^121540870 is an apocalyptic number.

121540870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121540870 is a deficient number, since it is larger than the sum of its proper divisors (118931642).

121540870 is a wasteful number, since it uses less digits than its factorization.

121540870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100476 (or 100465 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 121540870 is about 11024.5575874953. The cubic root of 121540870 is about 495.3446159918.

Adding to 121540870 its reverse (78045121), we get a palindrome (199585991).

The spelling of 121540870 in words is "one hundred twenty-one million, five hundred forty thousand, eight hundred seventy".