20927391211 has 2 divisors, whose sum is σ = 20927391212. Its totient is φ = 20927391210.

The previous prime is 20927391209. The next prime is 20927391223. The reversal of 20927391211 is 11219372902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20927391211 - 2¹ = 20927391209 is a prime.

Together with 20927391209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20927394211) 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, 10463695605 + 10463695606.

It is an arithmetic number, because the mean of its divisors is an integer number (10463695606).

Almost surely, 2^20927391211 is an apocalyptic number.

20927391211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20927391211 is an equidigital number, since it uses as much as digits as its factorization.

20927391211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 20927391211 in words is "twenty billion, nine hundred twenty-seven million, three hundred ninety-one thousand, two hundred eleven".