20944512117511 has 2 divisors, whose sum is σ = 20944512117512. Its totient is φ = 20944512117510.

The previous prime is 20944512117509. The next prime is 20944512117563. The reversal of 20944512117511 is 11571121544902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20944512117511 - 2¹ = 20944512117509 is a prime.

It is a super-2 number, since 2×20944512117511² (a number of 27 digits) contains 22 as substring.

Together with 20944512117509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20944522117511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472256058755 + 10472256058756.

It is an arithmetic number, because the mean of its divisors is an integer number (10472256058756).

Almost surely, 2^{20944512117511} is an apocalyptic number.

20944512117511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20944512117511 is an equidigital number, since it uses as much as digits as its factorization.

20944512117511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 20944512117511 in words is "twenty trillion, nine hundred forty-four billion, five hundred twelve million, one hundred seventeen thousand, five hundred eleven".