2145121103 has 4 divisors (see below), whose sum is σ = 2147978208. Its totient is φ = 2142264000.

The previous prime is 2145121087. The next prime is 2145121117. The reversal of 2145121103 is 3011215412.

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 2145121103 - 2⁴ = 2145121087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145121163) 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, 1427426 + ... + 1428927.

It is an arithmetic number, because the mean of its divisors is an integer number (536994552).

Almost surely, 2^2145121103 is an apocalyptic number.

2145121103 is a deficient number, since it is larger than the sum of its proper divisors (2857105).

2145121103 is an equidigital number, since it uses as much as digits as its factorization.

2145121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857104.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2145121103 is about 46315.4520975452. The cubic root of 2145121103 is about 1289.6858604501.

Adding to 2145121103 its reverse (3011215412), we get a palindrome (5156336515).

The spelling of 2145121103 in words is "two billion, one hundred forty-five million, one hundred twenty-one thousand, one hundred three".