1210221101 has 2 divisors, whose sum is σ = 1210221102. Its totient is φ = 1210221100.

The previous prime is 1210221043. The next prime is 1210221113. The reversal of 1210221101 is 1011220121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1209231076 + 990025 = 34774^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210221101 - 2⁶ = 1210221037 is a prime.

It is a super-2 number, since 2×1210221101² = 2929270226611304402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210221161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110550 + 605110551.

It is an arithmetic number, because the mean of its divisors is an integer number (605110551).

Almost surely, 2^1210221101 is an apocalyptic number.

It is an amenable number.

1210221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210221101 is an equidigital number, since it uses as much as digits as its factorization.

1210221101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1210221101 is about 34788.2322201057. The cubic root of 1210221101 is about 1065.6671379707.

Adding to 1210221101 its reverse (1011220121), we get a palindrome (2221441222).

The spelling of 1210221101 in words is "one billion, two hundred ten million, two hundred twenty-one thousand, one hundred one".