2121003403 has 4 divisors (see below), whose sum is σ = 2121127648. Its totient is φ = 2120879160.

The previous prime is 2121003371. The next prime is 2121003407. The reversal of 2121003403 is 3043001212.

It is a happy number.

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 2121003403 - 2⁵ = 2121003371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121003407) 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, 31476 + ... + 72337.

It is an arithmetic number, because the mean of its divisors is an integer number (530281912).

Almost surely, 2^2121003403 is an apocalyptic number.

2121003403 is a deficient number, since it is larger than the sum of its proper divisors (124245).

2121003403 is a wasteful number, since it uses less digits than its factorization.

2121003403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124244.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2121003403 is about 46054.3527041690. The cubic root of 2121003403 is about 1284.8342992140.

Adding to 2121003403 its reverse (3043001212), we get a palindrome (5164004615).

The spelling of 2121003403 in words is "two billion, one hundred twenty-one million, three thousand, four hundred three".