2003870021 has 2 divisors, whose sum is σ = 2003870022. Its totient is φ = 2003870020.

The previous prime is 2003869943. The next prime is 2003870081. The reversal of 2003870021 is 1200783002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1739807521 + 264062500 = 41711^2 + 16250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003870021 - 2³⁰ = 930128197 is a prime.

It is a super-2 number, since 2×2003870021² = 8030990122125080882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2003870081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001935010 + 1001935011.

It is an arithmetic number, because the mean of its divisors is an integer number (1001935011).

Almost surely, 2^2003870021 is an apocalyptic number.

It is an amenable number.

2003870021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003870021 is an equidigital number, since it uses as much as digits as its factorization.

2003870021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2003870021 is about 44764.6067892928. The cubic root of 2003870021 is about 1260.7331797802.

The spelling of 2003870021 in words is "two billion, three million, eight hundred seventy thousand, twenty-one".