21430203013 has 2 divisors, whose sum is σ = 21430203014. Its totient is φ = 21430203012.

The previous prime is 21430202987. The next prime is 21430203019. The reversal of 21430203013 is 31030203412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13076608609 + 8353594404 = 114353^2 + 91398^2 .

It is a cyclic number.

It is not a de Polignac number, because 21430203013 - 2⁹ = 21430202501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430203019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715101506 + 10715101507.

It is an arithmetic number, because the mean of its divisors is an integer number (10715101507).

Almost surely, 2^21430203013 is an apocalyptic number.

It is an amenable number.

21430203013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430203013 is an equidigital number, since it uses as much as digits as its factorization.

21430203013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21430203013 its reverse (31030203412), we get a palindrome (52460406425).

The spelling of 21430203013 in words is "twenty-one billion, four hundred thirty million, two hundred three thousand, thirteen".