121720604 has 12 divisors (see below), whose sum is σ = 213099264. Its totient is φ = 60835104.

The previous prime is 121720603. The next prime is 121720609. The reversal of 121720604 is 406027121.

It is a self number, because there is not a number n which added to its sum of digits gives 121720604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121720603) 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, 8357 + ... + 17699.

It is an arithmetic number, because the mean of its divisors is an integer number (17758272).

Almost surely, 2^121720604 is an apocalyptic number.

It is an amenable number.

121720604 is a deficient number, since it is larger than the sum of its proper divisors (91378660).

121720604 is a wasteful number, since it uses less digits than its factorization.

121720604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12604 (or 12602 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 121720604 is about 11032.7061050315. The cubic root of 121720604 is about 495.5886667362.

Adding to 121720604 its reverse (406027121), we get a palindrome (527747725).

The spelling of 121720604 in words is "one hundred twenty-one million, seven hundred twenty thousand, six hundred four".