2121503603 has 4 divisors (see below), whose sum is σ = 2125721808. Its totient is φ = 2117285400.

The previous prime is 2121503597. The next prime is 2121503623. The reversal of 2121503603 is 3063051212.

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 2121503603 - 2²⁰ = 2120455027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121503623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2108348 + ... + 2109353.

It is an arithmetic number, because the mean of its divisors is an integer number (531430452).

Almost surely, 2^2121503603 is an apocalyptic number.

2121503603 is a deficient number, since it is larger than the sum of its proper divisors (4218205).

2121503603 is an equidigital number, since it uses as much as digits as its factorization.

2121503603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218204.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2121503603 is about 46059.7829239348. The cubic root of 2121503603 is about 1284.9352928602.

Adding to 2121503603 its reverse (3063051212), we get a palindrome (5184554815).

The spelling of 2121503603 in words is "two billion, one hundred twenty-one million, five hundred three thousand, six hundred three".