210640132921 has 2 divisors, whose sum is σ = 210640132922. Its totient is φ = 210640132920.

The previous prime is 210640132919. The next prime is 210640132931. The reversal of 210640132921 is 129231046012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210639692025 + 440896 = 458955^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 210640132921 - 2¹ = 210640132919 is a prime.

Together with 210640132919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (210640132931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105320066460 + 105320066461.

It is an arithmetic number, because the mean of its divisors is an integer number (105320066461).

Almost surely, 2^210640132921 is an apocalyptic number.

It is an amenable number.

210640132921 is a deficient number, since it is larger than the sum of its proper divisors (1).

210640132921 is an equidigital number, since it uses as much as digits as its factorization.

210640132921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 210640132921 its reverse (129231046012), we get a palindrome (339871178933).

The spelling of 210640132921 in words is "two hundred ten billion, six hundred forty million, one hundred thirty-two thousand, nine hundred twenty-one".