1212110121251 has 2 divisors, whose sum is σ = 1212110121252. Its totient is φ = 1212110121250.

The previous prime is 1212110121197. The next prime is 1212110121281. The reversal of 1212110121251 is 1521210112121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212110121251 - 2²⁶ = 1212043012387 is a prime.

It is a super-2 number, since 2×1212110121251² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1212110121281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606055060625 + 606055060626.

It is an arithmetic number, because the mean of its divisors is an integer number (606055060626).

Almost surely, 2^{1212110121251} is an apocalyptic number.

1212110121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212110121251 is an equidigital number, since it uses as much as digits as its factorization.

1212110121251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 20.

Adding to 1212110121251 its reverse (1521210112121), we get a palindrome (2733320233372).

The spelling of 1212110121251 in words is "one trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, two hundred fifty-one".