121205603 has 8 divisors (see below), whose sum is σ = 122010000. Its totient is φ = 120404448.

The previous prime is 121205573. The next prime is 121205611. The reversal of 121205603 is 306502121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121205603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121205633) 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, 145793 + ... + 146621.

It is an arithmetic number, because the mean of its divisors is an integer number (15251250).

Almost surely, 2^121205603 is an apocalyptic number.

121205603 is a deficient number, since it is larger than the sum of its proper divisors (804397).

121205603 is an equidigital number, since it uses as much as digits as its factorization.

121205603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 121205603 is about 11009.3416242753. The cubic root of 121205603 is about 494.8887319202. Note that the first 3 decimals are identical.

Adding to 121205603 its reverse (306502121), we get a palindrome (427707724).

The spelling of 121205603 in words is "one hundred twenty-one million, two hundred five thousand, six hundred three".