1263412836121 has 2 divisors, whose sum is σ = 1263412836122. Its totient is φ = 1263412836120.

The previous prime is 1263412836089. The next prime is 1263412836157. The reversal of 1263412836121 is 1216382143621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1255152752896 + 8260083225 = 1120336^2 + 90885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263412836121 - 2⁵ = 1263412836089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263412836221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631706418060 + 631706418061.

It is an arithmetic number, because the mean of its divisors is an integer number (631706418061).

Almost surely, 2^{1263412836121} is an apocalyptic number.

It is an amenable number.

1263412836121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263412836121 is an equidigital number, since it uses as much as digits as its factorization.

1263412836121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

Adding to 1263412836121 its reverse (1216382143621), we get a palindrome (2479794979742).

The spelling of 1263412836121 in words is "one trillion, two hundred sixty-three billion, four hundred twelve million, eight hundred thirty-six thousand, one hundred twenty-one".