21252334189 has 2 divisors, whose sum is σ = 21252334190. Its totient is φ = 21252334188.

The previous prime is 21252334111. The next prime is 21252334217. The reversal of 21252334189 is 98143325212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19700368164 + 1551966025 = 140358^2 + 39395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21252334189 - 2⁹ = 21252333677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252334589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626167094 + 10626167095.

It is an arithmetic number, because the mean of its divisors is an integer number (10626167095).

Almost surely, 2^21252334189 is an apocalyptic number.

It is an amenable number.

21252334189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252334189 is an equidigital number, since it uses as much as digits as its factorization.

21252334189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The spelling of 21252334189 in words is "twenty-one billion, two hundred fifty-two million, three hundred thirty-four thousand, one hundred eighty-nine".