212204021257 has 2 divisors, whose sum is σ = 212204021258. Its totient is φ = 212204021256.

The previous prime is 212204021231. The next prime is 212204021261. The reversal of 212204021257 is 752120402212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173864814841 + 38339206416 = 416971^2 + 195804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212204021257 is a prime.

It is not a weakly prime, because it can be changed into another prime (212204021207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106102010628 + 106102010629.

It is an arithmetic number, because the mean of its divisors is an integer number (106102010629).

Almost surely, 2^212204021257 is an apocalyptic number.

It is an amenable number.

212204021257 is a deficient number, since it is larger than the sum of its proper divisors (1).

212204021257 is an equidigital number, since it uses as much as digits as its factorization.

212204021257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 28.

Adding to 212204021257 its reverse (752120402212), we get a palindrome (964324423469).

The spelling of 212204021257 in words is "two hundred twelve billion, two hundred four million, twenty-one thousand, two hundred fifty-seven".