2121803 has 2 divisors, whose sum is σ = 2121804. Its totient is φ = 2121802.

The previous prime is 2121797. The next prime is 2121809. The reversal of 2121803 is 3081212.

It is a balanced prime because it is at equal distance from previous prime (2121797) and next prime (2121809).

It is a cyclic number.

It is not a de Polignac number, because 2121803 - 2⁶ = 2121739 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2121809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060901 + 1060902.

It is an arithmetic number, because the mean of its divisors is an integer number (1060902).

2^2121803 is an apocalyptic number.

2121803 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121803 is an equidigital number, since it uses as much as digits as its factorization.

2121803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2121803 is about 1456.6409990111. The cubic root of 2121803 is about 128.4995735475.

The spelling of 2121803 in words is "two million, one hundred twenty-one thousand, eight hundred three".