121181928 has 32 divisors (see below), whose sum is σ = 346234560. Its totient is φ = 34623360.

The previous prime is 121181927. The next prime is 121181939. The reversal of 121181928 is 829181121.

It is not an unprimeable number, because it can be changed into a prime (121181927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360493 + ... + 360828.

It is an arithmetic number, because the mean of its divisors is an integer number (10819830).

Almost surely, 2^121181928 is an apocalyptic number.

It is an amenable number.

121181928 is an abundant number, since it is smaller than the sum of its proper divisors (225052632).

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

121181928 is a wasteful number, since it uses less digits than its factorization.

121181928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721337 (or 721333 counting only the distinct ones).

The product of its digits is 2304, while the sum is 33.

The square root of 121181928 is about 11008.2663485219. The cubic root of 121181928 is about 494.8565077397.

The spelling of 121181928 in words is "one hundred twenty-one million, one hundred eighty-one thousand, nine hundred twenty-eight".