1351221005633 has 2 divisors, whose sum is σ = 1351221005634. Its totient is φ = 1351221005632.

The previous prime is 1351221005573. The next prime is 1351221005669. The reversal of 1351221005633 is 3365001221531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 969628181809 + 381592823824 = 984697^2 + 617732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1351221005633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1351221005633.

It is not a weakly prime, because it can be changed into another prime (1351221065633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675610502816 + 675610502817.

It is an arithmetic number, because the mean of its divisors is an integer number (675610502817).

Almost surely, 2^{1351221005633} is an apocalyptic number.

It is an amenable number.

1351221005633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351221005633 is an equidigital number, since it uses as much as digits as its factorization.

1351221005633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 1351221005633 in words is "one trillion, three hundred fifty-one billion, two hundred twenty-one million, five thousand, six hundred thirty-three".