21000112012189 has 2 divisors, whose sum is σ = 21000112012190. Its totient is φ = 21000112012188.

The previous prime is 21000112012181. The next prime is 21000112012213. The reversal of 21000112012189 is 98121021100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19784036805625 + 1216075206564 = 4447925^2 + 1102758^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000112012189 - 2³ = 21000112012181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000112012181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500056006094 + 10500056006095.

It is an arithmetic number, because the mean of its divisors is an integer number (10500056006095).

Almost surely, 2^{21000112012189} is an apocalyptic number.

It is an amenable number.

21000112012189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000112012189 is an equidigital number, since it uses as much as digits as its factorization.

21000112012189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 21000112012189 in words is "twenty-one trillion, one hundred twelve million, twelve thousand, one hundred eighty-nine".