1621370508013 has 2 divisors, whose sum is σ = 1621370508014. Its totient is φ = 1621370508012.

The previous prime is 1621370507993. The next prime is 1621370508049. The reversal of 1621370508013 is 3108050731261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1451921371849 + 169449136164 = 1204957^2 + 411642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621370508013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621370508053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810685254006 + 810685254007.

It is an arithmetic number, because the mean of its divisors is an integer number (810685254007).

Almost surely, 2^{1621370508013} is an apocalyptic number.

It is an amenable number.

1621370508013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621370508013 is an equidigital number, since it uses as much as digits as its factorization.

1621370508013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 1621370508013 in words is "one trillion, six hundred twenty-one billion, three hundred seventy million, five hundred eight thousand, thirteen".