21310111189 has 2 divisors, whose sum is σ = 21310111190. Its totient is φ = 21310111188.

The previous prime is 21310111159. The next prime is 21310111217. The reversal of 21310111189 is 98111101312.

It is an a-pointer prime, because the next prime (21310111217) can be obtained adding 21310111189 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18014203089 + 3295908100 = 134217^2 + 57410^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310111189 - 2¹³ = 21310102997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310111159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655055594 + 10655055595.

It is an arithmetic number, because the mean of its divisors is an integer number (10655055595).

Almost surely, 2^21310111189 is an apocalyptic number.

It is an amenable number.

21310111189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310111189 is an equidigital number, since it uses as much as digits as its factorization.

21310111189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 28.

The spelling of 21310111189 in words is "twenty-one billion, three hundred ten million, one hundred eleven thousand, one hundred eighty-nine".