1212132121 has 2 divisors, whose sum is σ = 1212132122. Its totient is φ = 1212132120.

The previous prime is 1212132071. The next prime is 1212132143. The reversal of 1212132121 is 1212312121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 927872521 + 284259600 = 30461^2 + 16860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212132121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212132095 and 1212132104.

It is not a weakly prime, because it can be changed into another prime (1212132421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606066060 + 606066061.

It is an arithmetic number, because the mean of its divisors is an integer number (606066061).

Almost surely, 2^1212132121 is an apocalyptic number.

It is an amenable number.

1212132121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212132121 is an equidigital number, since it uses as much as digits as its factorization.

1212132121 is an evil number, because the sum of its binary digits is even.

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

The square root of 1212132121 is about 34815.6878576311. The cubic root of 1212132121 is about 1066.2277628633.

Adding to 1212132121 its reverse (1212312121), we get a palindrome (2424444242).

The spelling of 1212132121 in words is "one billion, two hundred twelve million, one hundred thirty-two thousand, one hundred twenty-one".