220220321857 has 2 divisors, whose sum is σ = 220220321858. Its totient is φ = 220220321856.

The previous prime is 220220321837. The next prime is 220220321873. The reversal of 220220321857 is 758123022022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219196257856 + 1024064001 = 468184^2 + 32001^2 .

It is a cyclic number.

It is not a de Polignac number, because 220220321857 - 2¹⁹ = 220219797569 is a prime.

It is not a weakly prime, because it can be changed into another prime (220220321837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110110160928 + 110110160929.

It is an arithmetic number, because the mean of its divisors is an integer number (110110160929).

Almost surely, 2^220220321857 is an apocalyptic number.

It is an amenable number.

220220321857 is a deficient number, since it is larger than the sum of its proper divisors (1).

220220321857 is an equidigital number, since it uses as much as digits as its factorization.

220220321857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

Adding to 220220321857 its reverse (758123022022), we get a palindrome (978343343879).

The spelling of 220220321857 in words is "two hundred twenty billion, two hundred twenty million, three hundred twenty-one thousand, eight hundred fifty-seven".