1321012010249 has 2 divisors, whose sum is σ = 1321012010250. Its totient is φ = 1321012010248.

The previous prime is 1321012010237. The next prime is 1321012010251. The reversal of 1321012010249 is 9420102101231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079454505024 + 241557505225 = 1038968^2 + 491485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321012010249 is a prime.

Together with 1321012010251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1321012010449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660506005124 + 660506005125.

It is an arithmetic number, because the mean of its divisors is an integer number (660506005125).

Almost surely, 2^{1321012010249} is an apocalyptic number.

It is an amenable number.

1321012010249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321012010249 is an equidigital number, since it uses as much as digits as its factorization.

1321012010249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 1321012010249 in words is "one trillion, three hundred twenty-one billion, twelve million, ten thousand, two hundred forty-nine".