2403020021 has 2 divisors, whose sum is σ = 2403020022. Its totient is φ = 2403020020.

The previous prime is 2403019981. The next prime is 2403020029. The reversal of 2403020021 is 1200203042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1741810225 + 661209796 = 41735^2 + 25714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2403020021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2403019978 and 2403020005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2403020029) 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, 1201510010 + 1201510011.

It is an arithmetic number, because the mean of its divisors is an integer number (1201510011).

Almost surely, 2^2403020021 is an apocalyptic number.

It is an amenable number.

2403020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2403020021 is an equidigital number, since it uses as much as digits as its factorization.

2403020021 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 14.

The square root of 2403020021 is about 49020.6081255629. The cubic root of 2403020021 is about 1339.4272485427.

Adding to 2403020021 its reverse (1200203042), we get a palindrome (3603223063).

The spelling of 2403020021 in words is "two billion, four hundred three million, twenty thousand, twenty-one".