221020110257 has 2 divisors, whose sum is σ = 221020110258. Its totient is φ = 221020110256.

The previous prime is 221020110221. The next prime is 221020110301. The reversal of 221020110257 is 752011020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206805748081 + 14214362176 = 454759^2 + 119224^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020110257 - 2¹² = 221020106161 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020110557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510055128 + 110510055129.

It is an arithmetic number, because the mean of its divisors is an integer number (110510055129).

Almost surely, 2^221020110257 is an apocalyptic number.

It is an amenable number.

221020110257 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020110257 is an equidigital number, since it uses as much as digits as its factorization.

221020110257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 221020110257 its reverse (752011020122), we get a palindrome (973031130379).

The spelling of 221020110257 in words is "two hundred twenty-one billion, twenty million, one hundred ten thousand, two hundred fifty-seven".