213201232261 has 2 divisors, whose sum is σ = 213201232262. Its totient is φ = 213201232260.

The previous prime is 213201232243. The next prime is 213201232339. The reversal of 213201232261 is 162232102312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171735648100 + 41465584161 = 414410^2 + 203631^2 .

It is a cyclic number.

It is not a de Polignac number, because 213201232261 - 2¹⁷ = 213201101189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213201232061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106600616130 + 106600616131.

It is an arithmetic number, because the mean of its divisors is an integer number (106600616131).

Almost surely, 2^213201232261 is an apocalyptic number.

It is an amenable number.

213201232261 is a deficient number, since it is larger than the sum of its proper divisors (1).

213201232261 is an equidigital number, since it uses as much as digits as its factorization.

213201232261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 213201232261 its reverse (162232102312), we get a palindrome (375433334573).

The spelling of 213201232261 in words is "two hundred thirteen billion, two hundred one million, two hundred thirty-two thousand, two hundred sixty-one".