21203110013 has 2 divisors, whose sum is σ = 21203110014. Its totient is φ = 21203110012.

The previous prime is 21203110009. The next prime is 21203110037. The reversal of 21203110013 is 31001130212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14112964804 + 7090145209 = 118798^2 + 84203^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203110013 - 2² = 21203110009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21203110013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203110213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601555006 + 10601555007.

It is an arithmetic number, because the mean of its divisors is an integer number (10601555007).

Almost surely, 2^21203110013 is an apocalyptic number.

It is an amenable number.

21203110013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203110013 is an equidigital number, since it uses as much as digits as its factorization.

21203110013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21203110013 its reverse (31001130212), we get a palindrome (52204240225).

The spelling of 21203110013 in words is "twenty-one billion, two hundred three million, one hundred ten thousand, thirteen".