213123031057 has 2 divisors, whose sum is σ = 213123031058. Its totient is φ = 213123031056.

The previous prime is 213123031031. The next prime is 213123031127. The reversal of 213123031057 is 750130321312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121437613441 + 91685417616 = 348479^2 + 302796^2 .

It is a cyclic number.

It is not a de Polignac number, because 213123031057 - 2¹⁵ = 213122998289 is a prime.

It is not a weakly prime, because it can be changed into another prime (213123031157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561515528 + 106561515529.

It is an arithmetic number, because the mean of its divisors is an integer number (106561515529).

Almost surely, 2^213123031057 is an apocalyptic number.

It is an amenable number.

213123031057 is a deficient number, since it is larger than the sum of its proper divisors (1).

213123031057 is an equidigital number, since it uses as much as digits as its factorization.

213123031057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 28.

Adding to 213123031057 its reverse (750130321312), we get a palindrome (963253352369).

The spelling of 213123031057 in words is "two hundred thirteen billion, one hundred twenty-three million, thirty-one thousand, fifty-seven".