221202100121 has 2 divisors, whose sum is σ = 221202100122. Its totient is φ = 221202100120.

The previous prime is 221202100081. The next prime is 221202100151. The reversal of 221202100121 is 121001202122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207357283225 + 13844816896 = 455365^2 + 117664^2 .

It is a cyclic number.

It is not a de Polignac number, because 221202100121 - 2¹⁴ = 221202083737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221202100096 and 221202100105.

It is not a weakly prime, because it can be changed into another prime (221202100151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601050060 + 110601050061.

It is an arithmetic number, because the mean of its divisors is an integer number (110601050061).

Almost surely, 2^221202100121 is an apocalyptic number.

It is an amenable number.

221202100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221202100121 is an equidigital number, since it uses as much as digits as its factorization.

221202100121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221202100121 its reverse (121001202122), we get a palindrome (342203302243).

The spelling of 221202100121 in words is "two hundred twenty-one billion, two hundred two million, one hundred thousand, one hundred twenty-one".