21106775111 has 2 divisors, whose sum is σ = 21106775112. Its totient is φ = 21106775110.

The previous prime is 21106775101. The next prime is 21106775143. The reversal of 21106775111 is 11157760112.

It is an a-pointer prime, because the next prime (21106775143) can be obtained adding 21106775111 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21106775111 - 2²⁶ = 21039666247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106775101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553387555 + 10553387556.

It is an arithmetic number, because the mean of its divisors is an integer number (10553387556).

Almost surely, 2^21106775111 is an apocalyptic number.

21106775111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106775111 is an equidigital number, since it uses as much as digits as its factorization.

21106775111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 32.

The spelling of 21106775111 in words is "twenty-one billion, one hundred six million, seven hundred seventy-five thousand, one hundred eleven".