1220106221 has 2 divisors, whose sum is σ = 1220106222. Its totient is φ = 1220106220.

The previous prime is 1220106211. The next prime is 1220106271. The reversal of 1220106221 is 1226010221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682515625 + 537590596 = 26125^2 + 23186^2 .

It is an emirp because it is prime and its reverse (1226010221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220106221 - 2⁶ = 1220106157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220106221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220106211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610053110 + 610053111.

It is an arithmetic number, because the mean of its divisors is an integer number (610053111).

Almost surely, 2^1220106221 is an apocalyptic number.

It is an amenable number.

1220106221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220106221 is an equidigital number, since it uses as much as digits as its factorization.

1220106221 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 1220106221 is about 34930.0189092419. The cubic root of 1220106221 is about 1068.5607402589.

Adding to 1220106221 its reverse (1226010221), we get a palindrome (2446116442).

The spelling of 1220106221 in words is "one billion, two hundred twenty million, one hundred six thousand, two hundred twenty-one".