210013030021 has 2 divisors, whose sum is σ = 210013030022. Its totient is φ = 210013030020.

The previous prime is 210013030013. The next prime is 210013030069. The reversal of 210013030021 is 120030310012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209410572996 + 602457025 = 457614^2 + 24545^2 .

It is a cyclic number.

It is not a de Polignac number, because 210013030021 - 2³ = 210013030013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210013029983 and 210013030010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210013030081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105006515010 + 105006515011.

It is an arithmetic number, because the mean of its divisors is an integer number (105006515011).

Almost surely, 2^210013030021 is an apocalyptic number.

It is an amenable number.

210013030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210013030021 is an equidigital number, since it uses as much as digits as its factorization.

210013030021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 210013030021 its reverse (120030310012), we get a palindrome (330043340033).

The spelling of 210013030021 in words is "two hundred ten billion, thirteen million, thirty thousand, twenty-one".