19928513779211 has 2 divisors, whose sum is σ = 19928513779212. Its totient is φ = 19928513779210.

The previous prime is 19928513779177. The next prime is 19928513779219. The reversal of 19928513779211 is 11297731582991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19928513779211 - 2³⁰ = 19927440037387 is a prime.

It is a super-2 number, since 2×19928513779211² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19928513779219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9964256889605 + 9964256889606.

It is an arithmetic number, because the mean of its divisors is an integer number (9964256889606).

Almost surely, 2^{19928513779211} is an apocalyptic number.

19928513779211 is a deficient number, since it is larger than the sum of its proper divisors (1).

19928513779211 is an equidigital number, since it uses as much as digits as its factorization.

19928513779211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 65.

The spelling of 19928513779211 in words is "nineteen trillion, nine hundred twenty-eight billion, five hundred thirteen million, seven hundred seventy-nine thousand, two hundred eleven".