21240233204189 has 2 divisors, whose sum is σ = 21240233204190. Its totient is φ = 21240233204188.

The previous prime is 21240233204161. The next prime is 21240233204213. The reversal of 21240233204189 is 98140233204212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17377601136025 + 3862632068164 = 4168645^2 + 1965358^2 .

It is a cyclic number.

It is not a de Polignac number, because 21240233204189 - 2³⁶ = 21171513727453 is a prime.

It is a super-2 number, since 2×21240233204189² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21240233200189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620116602094 + 10620116602095.

It is an arithmetic number, because the mean of its divisors is an integer number (10620116602095).

Almost surely, 2^{21240233204189} is an apocalyptic number.

It is an amenable number.

21240233204189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240233204189 is an equidigital number, since it uses as much as digits as its factorization.

21240233204189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 21240233204189 in words is "twenty-one trillion, two hundred forty billion, two hundred thirty-three million, two hundred four thousand, one hundred eighty-nine".