210232231981 has 2 divisors, whose sum is σ = 210232231982. Its totient is φ = 210232231980.

The previous prime is 210232231967. The next prime is 210232232057. The reversal of 210232231981 is 189132232012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135534422500 + 74697809481 = 368150^2 + 273309^2 .

It is a cyclic number.

It is not a de Polignac number, because 210232231981 - 2¹⁷ = 210232100909 is a prime.

It is a super-2 number, since 2×210232231981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210232234981) 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, 105116115990 + 105116115991.

It is an arithmetic number, because the mean of its divisors is an integer number (105116115991).

Almost surely, 2^210232231981 is an apocalyptic number.

It is an amenable number.

210232231981 is a deficient number, since it is larger than the sum of its proper divisors (1).

210232231981 is an equidigital number, since it uses as much as digits as its factorization.

210232231981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

Adding to 210232231981 its reverse (189132232012), we get a palindrome (399364463993).

The spelling of 210232231981 in words is "two hundred ten billion, two hundred thirty-two million, two hundred thirty-one thousand, nine hundred eighty-one".