2100121100203 has 32 divisors (see below), whose sum is σ = 2419531779456. Its totient is φ = 1785622745088.

The previous prime is 2100121100197. The next prime is 2100121100221. The reversal of 2100121100203 is 3020011210012.

It is not a de Polignac number, because 2100121100203 - 2¹³ = 2100121092011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100121100243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 923941275 + ... + 923943547.

It is an arithmetic number, because the mean of its divisors is an integer number (75610368108).

Almost surely, 2^{2100121100203} is an apocalyptic number.

2100121100203 is a deficient number, since it is larger than the sum of its proper divisors (319410679253).

2100121100203 is a wasteful number, since it uses less digits than its factorization.

2100121100203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4183.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 2100121100203 its reverse (3020011210012), we get a palindrome (5120132310215).

The spelling of 2100121100203 in words is "two trillion, one hundred billion, one hundred twenty-one million, one hundred thousand, two hundred three".