121155928 has 8 divisors (see below), whose sum is σ = 227167380. Its totient is φ = 60577960.

The previous prime is 121155919. The next prime is 121155929. The reversal of 121155928 is 829551121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 121155893 and 121155902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121155929) 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 as a sum of consecutive naturals, namely, 7572238 + ... + 7572253.

Almost surely, 2^121155928 is an apocalyptic number.

It is an amenable number.

121155928 is a deficient number, since it is larger than the sum of its proper divisors (106011452).

121155928 is a wasteful number, since it uses less digits than its factorization.

121155928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15144497 (or 15144493 counting only the distinct ones).

The product of its digits is 7200, while the sum is 34.

The square root of 121155928 is about 11007.0853544433. The cubic root of 121155928 is about 494.8211141523.

The spelling of 121155928 in words is "one hundred twenty-one million, one hundred fifty-five thousand, nine hundred twenty-eight".