1221100230121 has 2 divisors, whose sum is σ = 1221100230122. Its totient is φ = 1221100230120.

The previous prime is 1221100230079. The next prime is 1221100230127. The reversal of 1221100230121 is 1210320011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068816874896 + 152283355225 = 1033836^2 + 390235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221100230121 - 2¹⁷ = 1221100099049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221100230095 and 1221100230104.

It is not a weakly prime, because it can be changed into another prime (1221100230127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550115060 + 610550115061.

It is an arithmetic number, because the mean of its divisors is an integer number (610550115061).

Almost surely, 2^{1221100230121} is an apocalyptic number.

It is an amenable number.

1221100230121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100230121 is an equidigital number, since it uses as much as digits as its factorization.

1221100230121 is an evil number, because the sum of its binary digits is even.

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

Adding to 1221100230121 its reverse (1210320011221), we get a palindrome (2431420241342).

The spelling of 1221100230121 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred thirty thousand, one hundred twenty-one".