2100121003 has 2 divisors, whose sum is σ = 2100121004. Its totient is φ = 2100121002.

The previous prime is 2100120941. The next prime is 2100121021. The reversal of 2100121003 is 3001210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100121003 - 2¹³ = 2100112811 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100121103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050060501 + 1050060502.

It is an arithmetic number, because the mean of its divisors is an integer number (1050060502).

Almost surely, 2^2100121003 is an apocalyptic number.

2100121003 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100121003 is an equidigital number, since it uses as much as digits as its factorization.

2100121003 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2100121003 is about 45827.0771815092. The cubic root of 2100121003 is about 1280.6037603755.

Adding to 2100121003 its reverse (3001210012), we get a palindrome (5101331015).

The spelling of 2100121003 in words is "two billion, one hundred million, one hundred twenty-one thousand, three".