21202131001 has 2 divisors, whose sum is σ = 21202131002. Its totient is φ = 21202131000.

The previous prime is 21202130947. The next prime is 21202131011. The reversal of 21202131001 is 10013120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20897593600 + 304537401 = 144560^2 + 17451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202131001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202131011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601065500 + 10601065501.

It is an arithmetic number, because the mean of its divisors is an integer number (10601065501).

Almost surely, 2^21202131001 is an apocalyptic number.

It is an amenable number.

21202131001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202131001 is an equidigital number, since it uses as much as digits as its factorization.

21202131001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21202131001 its reverse (10013120212), we get a palindrome (31215251213).

The spelling of 21202131001 in words is "twenty-one billion, two hundred two million, one hundred thirty-one thousand, one".