1212100121 has 2 divisors, whose sum is σ = 1212100122. Its totient is φ = 1212100120.

The previous prime is 1212100067. The next prime is 1212100129. The reversal of 1212100121 is 1210012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1124864521 + 87235600 = 33539^2 + 9340^2 .

It is an emirp because it is prime and its reverse (1210012121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212100121 - 2¹⁴ = 1212083737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212100129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606050060 + 606050061.

It is an arithmetic number, because the mean of its divisors is an integer number (606050061).

Almost surely, 2^1212100121 is an apocalyptic number.

It is an amenable number.

1212100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212100121 is an equidigital number, since it uses as much as digits as its factorization.

1212100121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1212100121 is about 34815.2282916542. The cubic root of 1212100121 is about 1066.2183800609.

Adding to 1212100121 its reverse (1210012121), we get a palindrome (2422112242).

The spelling of 1212100121 in words is "one billion, two hundred twelve million, one hundred thousand, one hundred twenty-one".