221132100121 has 2 divisors, whose sum is σ = 221132100122. Its totient is φ = 221132100120.

The previous prime is 221132100109. The next prime is 221132100199. The reversal of 221132100121 is 121001231122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136837107225 + 84294992896 = 369915^2 + 290336^2 .

It is a cyclic number.

It is not a de Polignac number, because 221132100121 - 2⁵ = 221132100089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221132100095 and 221132100104.

It is not a weakly prime, because it can be changed into another prime (221132100221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110566050060 + 110566050061.

It is an arithmetic number, because the mean of its divisors is an integer number (110566050061).

Almost surely, 2^221132100121 is an apocalyptic number.

It is an amenable number.

221132100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221132100121 is an equidigital number, since it uses as much as digits as its factorization.

221132100121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221132100121 its reverse (121001231122), we get a palindrome (342133331243).

The spelling of 221132100121 in words is "two hundred twenty-one billion, one hundred thirty-two million, one hundred thousand, one hundred twenty-one".