121540078 has 16 divisors (see below), whose sum is σ = 201404160. Its totient is φ = 54545400.

The previous prime is 121540063. The next prime is 121540099. The reversal of 121540078 is 870045121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33228 + ... + 36703.

It is an arithmetic number, because the mean of its divisors is an integer number (12587760).

Almost surely, 2^121540078 is an apocalyptic number.

121540078 is a deficient number, since it is larger than the sum of its proper divisors (79864082).

121540078 is a wasteful number, since it uses less digits than its factorization.

121540078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70023.

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

The square root of 121540078 is about 11024.5216676280. The cubic root of 121540078 is about 495.3435400471.

Adding to 121540078 its reverse (870045121), we get a palindrome (991585199).

The spelling of 121540078 in words is "one hundred twenty-one million, five hundred forty thousand, seventy-eight".