20106251111 has 2 divisors, whose sum is σ = 20106251112. Its totient is φ = 20106251110.

The previous prime is 20106251089. The next prime is 20106251147. The reversal of 20106251111 is 11115260102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20106251111 - 2¹⁸ = 20105988967 is a prime.

It is a super-2 number, since 2×20106251111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20106251161) 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, 10053125555 + 10053125556.

It is an arithmetic number, because the mean of its divisors is an integer number (10053125556).

Almost surely, 2^20106251111 is an apocalyptic number.

20106251111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20106251111 is an equidigital number, since it uses as much as digits as its factorization.

20106251111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 20.

The spelling of 20106251111 in words is "twenty billion, one hundred six million, two hundred fifty-one thousand, one hundred eleven".