2100121310003 has 4 divisors (see below), whose sum is σ = 2172539286240. Its totient is φ = 2027703333768.

The previous prime is 2100121309967. The next prime is 2100121310011. The reversal of 2100121310003 is 3000131210012.

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 2100121310003 - 2¹² = 2100121305907 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 2100121310003.

It is not an unprimeable number, because it can be changed into a prime (2100121310093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36208988075 + ... + 36208988132.

It is an arithmetic number, because the mean of its divisors is an integer number (543134821560).

Almost surely, 2^{2100121310003} is an apocalyptic number.

2100121310003 is a deficient number, since it is larger than the sum of its proper divisors (72417976237).

2100121310003 is an equidigital number, since it uses as much as digits as its factorization.

2100121310003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72417976236.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 2100121310003 its reverse (3000131210012), we get a palindrome (5100252520015).

Subtracting 2100121310003 from its reverse (3000131210012), we obtain a palindrome (900009900009).

The spelling of 2100121310003 in words is "two trillion, one hundred billion, one hundred twenty-one million, three hundred ten thousand, three".