213442972361 has 2 divisors, whose sum is σ = 213442972362. Its totient is φ = 213442972360.

The previous prime is 213442972357. The next prime is 213442972373. The reversal of 213442972361 is 163279244312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176247992761 + 37194979600 = 419819^2 + 192860^2 .

It is a cyclic number.

It is not a de Polignac number, because 213442972361 - 2² = 213442972357 is a prime.

It is not a weakly prime, because it can be changed into another prime (213442971361) 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, 106721486180 + 106721486181.

It is an arithmetic number, because the mean of its divisors is an integer number (106721486181).

Almost surely, 2^213442972361 is an apocalyptic number.

It is an amenable number.

213442972361 is a deficient number, since it is larger than the sum of its proper divisors (1).

213442972361 is an equidigital number, since it uses as much as digits as its factorization.

213442972361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 44.

The spelling of 213442972361 in words is "two hundred thirteen billion, four hundred forty-two million, nine hundred seventy-two thousand, three hundred sixty-one".