221010212202257 has 2 divisors, whose sum is σ = 221010212202258. Its totient is φ = 221010212202256.

The previous prime is 221010212202191. The next prime is 221010212202259. The reversal of 221010212202257 is 752202212010122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192752099823361 + 28258112378896 = 13883519^2 + 5315836^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010212202257 - 2¹² = 221010212198161 is a prime.

Together with 221010212202259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221010212202259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505106101128 + 110505106101129.

It is an arithmetic number, because the mean of its divisors is an integer number (110505106101129).

Almost surely, 2^{221010212202257} is an apocalyptic number.

It is an amenable number.

221010212202257 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010212202257 is an equidigital number, since it uses as much as digits as its factorization.

221010212202257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 29.

Adding to 221010212202257 its reverse (752202212010122), we get a palindrome (973212424212379).

The spelling of 221010212202257 in words is "two hundred twenty-one trillion, ten billion, two hundred twelve million, two hundred two thousand, two hundred fifty-seven".