1252312121 has 2 divisors, whose sum is σ = 1252312122. Its totient is φ = 1252312120.

The previous prime is 1252312099. The next prime is 1252312141. The reversal of 1252312121 is 1212132521.

It is an a-pointer prime, because the next prime (1252312141) can be obtained adding 1252312121 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972753721 + 279558400 = 31189^2 + 16720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252312121 - 2¹⁰ = 1252311097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1252312093 and 1252312102.

It is not a weakly prime, because it can be changed into another prime (1252312141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626156060 + 626156061.

It is an arithmetic number, because the mean of its divisors is an integer number (626156061).

Almost surely, 2^1252312121 is an apocalyptic number.

It is an amenable number.

1252312121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252312121 is an equidigital number, since it uses as much as digits as its factorization.

1252312121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 1252312121 is about 35388.0222815574. The cubic root of 1252312121 is about 1077.8811110873.

Adding to 1252312121 its reverse (1212132521), we get a palindrome (2464444642).

The spelling of 1252312121 in words is "one billion, two hundred fifty-two million, three hundred twelve thousand, one hundred twenty-one".