2221020161 has 2 divisors, whose sum is σ = 2221020162. Its totient is φ = 2221020160.

The previous prime is 2221020121. The next prime is 2221020227. The reversal of 2221020161 is 1610201222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1447345936 + 773674225 = 38044^2 + 27815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221020161 - 2²⁶ = 2153911297 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221020121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110510080 + 1110510081.

It is an arithmetic number, because the mean of its divisors is an integer number (1110510081).

Almost surely, 2^2221020161 is an apocalyptic number.

It is an amenable number.

2221020161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221020161 is an equidigital number, since it uses as much as digits as its factorization.

2221020161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2221020161 is about 47127.7005698347. The cubic root of 2221020161 is about 1304.7205424218.

Adding to 2221020161 its reverse (1610201222), we get a palindrome (3831221383).

The spelling of 2221020161 in words is "two billion, two hundred twenty-one million, twenty thousand, one hundred sixty-one".