21030013001 has 2 divisors, whose sum is σ = 21030013002. Its totient is φ = 21030013000.

The previous prime is 21030012989. The next prime is 21030013007. The reversal of 21030013001 is 10031003012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14060267776 + 6969745225 = 118576^2 + 83485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030013001 is a prime.

It is a super-2 number, since 2×21030013001² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21030013007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515006500 + 10515006501.

It is an arithmetic number, because the mean of its divisors is an integer number (10515006501).

Almost surely, 2^21030013001 is an apocalyptic number.

It is an amenable number.

21030013001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030013001 is an equidigital number, since it uses as much as digits as its factorization.

21030013001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21030013001 its reverse (10031003012), we get a palindrome (31061016013).

The spelling of 21030013001 in words is "twenty-one billion, thirty million, thirteen thousand, one".