121005603 has 36 divisors (see below), whose sum is σ = 188240520. Its totient is φ = 76821696.

The previous prime is 121005601. The next prime is 121005613. The reversal of 121005603 is 306500121.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

121005603 is a `hidden beast` number, since 1 + 2 + 100 + 560 + 3 = 666.

It is not a de Polignac number, because 121005603 - 2¹ = 121005601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121005601) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1657575 + ... + 1657647.

Almost surely, 2^121005603 is an apocalyptic number.

121005603 is a deficient number, since it is larger than the sum of its proper divisors (67234917).

121005603 is an frugal number, since it uses more digits than its factorization.

121005603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 121005603 is about 11000.2546788699. The cubic root of 121005603 is about 494.6163786224.

Adding to 121005603 its reverse (306500121), we get a palindrome (427505724).

The spelling of 121005603 in words is "one hundred twenty-one million, five thousand, six hundred three".