213431342057 has 2 divisors, whose sum is σ = 213431342058. Its totient is φ = 213431342056.

The previous prime is 213431342023. The next prime is 213431342077. The reversal of 213431342057 is 750243134312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201112783936 + 12318558121 = 448456^2 + 110989^2 .

It is a cyclic number.

It is not a de Polignac number, because 213431342057 - 2⁶ = 213431341993 is a prime.

It is not a weakly prime, because it can be changed into another prime (213431342077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106715671028 + 106715671029.

It is an arithmetic number, because the mean of its divisors is an integer number (106715671029).

Almost surely, 2^213431342057 is an apocalyptic number.

It is an amenable number.

213431342057 is a deficient number, since it is larger than the sum of its proper divisors (1).

213431342057 is an equidigital number, since it uses as much as digits as its factorization.

213431342057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 35.

Adding to 213431342057 its reverse (750243134312), we get a palindrome (963674476369).

The spelling of 213431342057 in words is "two hundred thirteen billion, four hundred thirty-one million, three hundred forty-two thousand, fifty-seven".