121172072 has 16 divisors (see below), whose sum is σ = 259654560. Its totient is φ = 51930864.

The previous prime is 121172071. The next prime is 121172083. The reversal of 121172072 is 270271121.

It is not an unprimeable number, because it can be changed into a prime (121172071) 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 3 ways as a sum of consecutive naturals, for example, 1081838 + ... + 1081949.

It is an arithmetic number, because the mean of its divisors is an integer number (16228410).

Almost surely, 2^121172072 is an apocalyptic number.

It is an amenable number.

121172072 is an abundant number, since it is smaller than the sum of its proper divisors (138482488).

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

121172072 is a wasteful number, since it uses less digits than its factorization.

121172072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163800 (or 2163796 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 121172072 is about 11007.8186758322. The cubic root of 121172072 is about 494.8430914434.

The spelling of 121172072 in words is "one hundred twenty-one million, one hundred seventy-two thousand, seventy-two".