2121000103 has 4 divisors (see below), whose sum is σ = 2122779168. Its totient is φ = 2119221040.

The previous prime is 2121000059. The next prime is 2121000109. The reversal of 2121000103 is 3010001212.

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 2121000103 - 2²⁵ = 2087445671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121000103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121000109) 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, 887743 + ... + 890128.

It is an arithmetic number, because the mean of its divisors is an integer number (530694792).

Almost surely, 2^2121000103 is an apocalyptic number.

2121000103 is a deficient number, since it is larger than the sum of its proper divisors (1779065).

2121000103 is a wasteful number, since it uses less digits than its factorization.

2121000103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779064.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2121000103 is about 46054.3168769226. The cubic root of 2121000103 is about 1284.8336328697.

Adding to 2121000103 its reverse (3010001212), we get a palindrome (5131001315).

The spelling of 2121000103 in words is "two billion, one hundred twenty-one million, one hundred three", and thus it is an aban number.