121642603 has 4 divisors (see below), whose sum is σ = 121790520. Its totient is φ = 121494688.

The previous prime is 121642597. The next prime is 121642621. The reversal of 121642603 is 306246121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121642603 - 2⁹ = 121642091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121648603) 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, 72718 + ... + 74371.

It is an arithmetic number, because the mean of its divisors is an integer number (30447630).

Almost surely, 2^121642603 is an apocalyptic number.

121642603 is a deficient number, since it is larger than the sum of its proper divisors (147917).

121642603 is an equidigital number, since it uses as much as digits as its factorization.

121642603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147916.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 121642603 is about 11029.1705490486. The cubic root of 121642603 is about 495.4827830690.

Adding to 121642603 its reverse (306246121), we get a palindrome (427888724).

The spelling of 121642603 in words is "one hundred twenty-one million, six hundred forty-two thousand, six hundred three".