121717072 has 10 divisors (see below), whose sum is σ = 235826858. Its totient is φ = 60858528.

The previous prime is 121717051. The next prime is 121717073. The reversal of 121717072 is 270717121.

It can be written as a sum of positive squares in only one way, i.e., 121352256 + 364816 = 11016^2 + 604^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121717072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121717073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3803643 + ... + 3803674.

Almost surely, 2^121717072 is an apocalyptic number.

It is an amenable number.

121717072 is a deficient number, since it is larger than the sum of its proper divisors (114109786).

121717072 is an equidigital number, since it uses as much as digits as its factorization.

121717072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607325 (or 7607319 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 121717072 is about 11032.5460343476. The cubic root of 121717072 is about 495.5838731460.

The spelling of 121717072 in words is "one hundred twenty-one million, seven hundred seventeen thousand, seventy-two".