121304721 has 8 divisors (see below), whose sum is σ = 170252320. Its totient is φ = 76613472.

The previous prime is 121304717. The next prime is 121304747. The reversal of 121304721 is 127403121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121304721 - 2² = 121304717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121304021) 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, 1064020 + ... + 1064133.

It is an arithmetic number, because the mean of its divisors is an integer number (21281540).

Almost surely, 2^121304721 is an apocalyptic number.

It is an amenable number.

121304721 is a deficient number, since it is larger than the sum of its proper divisors (48947599).

121304721 is a wasteful number, since it uses less digits than its factorization.

121304721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128175.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 121304721 is about 11013.8422451023. The cubic root of 121304721 is about 495.0235964672.

Adding to 121304721 its reverse (127403121), we get a palindrome (248707842).

The spelling of 121304721 in words is "one hundred twenty-one million, three hundred four thousand, seven hundred twenty-one".