212052251657 has 2 divisors, whose sum is σ = 212052251658. Its totient is φ = 212052251656.

The previous prime is 212052251623. The next prime is 212052251731. The reversal of 212052251657 is 756152250212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206174116096 + 5878135561 = 454064^2 + 76669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212052251657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212052251657.

It is not a weakly prime, because it can be changed into another prime (212052254657) 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, 106026125828 + 106026125829.

It is an arithmetic number, because the mean of its divisors is an integer number (106026125829).

Almost surely, 2^212052251657 is an apocalyptic number.

It is an amenable number.

212052251657 is a deficient number, since it is larger than the sum of its proper divisors (1).

212052251657 is an equidigital number, since it uses as much as digits as its factorization.

212052251657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 38.

The spelling of 212052251657 in words is "two hundred twelve billion, fifty-two million, two hundred fifty-one thousand, six hundred fifty-seven".