1021720677113 has 2 divisors, whose sum is σ = 1021720677114. Its totient is φ = 1021720677112.

The previous prime is 1021720677071. The next prime is 1021720677127. The reversal of 1021720677113 is 3117760271201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977029448704 + 44691228409 = 988448^2 + 211403^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021720677113 - 2¹⁶ = 1021720611577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021720679113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510860338556 + 510860338557.

It is an arithmetic number, because the mean of its divisors is an integer number (510860338557).

Almost surely, 2^{1021720677113} is an apocalyptic number.

It is an amenable number.

1021720677113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021720677113 is an equidigital number, since it uses as much as digits as its factorization.

1021720677113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 38.

The spelling of 1021720677113 in words is "one trillion, twenty-one billion, seven hundred twenty million, six hundred seventy-seven thousand, one hundred thirteen".