21210310001 has 2 divisors, whose sum is σ = 21210310002. Its totient is φ = 21210310000.

The previous prime is 21210309983. The next prime is 21210310007. The reversal of 21210310001 is 10001301212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16051623025 + 5158686976 = 126695^2 + 71824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210310001 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21210310007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605155000 + 10605155001.

It is an arithmetic number, because the mean of its divisors is an integer number (10605155001).

Almost surely, 2^21210310001 is an apocalyptic number.

It is an amenable number.

21210310001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210310001 is an equidigital number, since it uses as much as digits as its factorization.

21210310001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21210310001 its reverse (10001301212), we get a palindrome (31211611213).

The spelling of 21210310001 in words is "twenty-one billion, two hundred ten million, three hundred ten thousand, one".