21442303189 has 2 divisors, whose sum is σ = 21442303190. Its totient is φ = 21442303188.

The previous prime is 21442303163. The next prime is 21442303217. The reversal of 21442303189 is 98130324412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18589140964 + 2853162225 = 136342^2 + 53415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442303189 - 2⁷ = 21442303061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442303889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721151594 + 10721151595.

It is an arithmetic number, because the mean of its divisors is an integer number (10721151595).

Almost surely, 2^21442303189 is an apocalyptic number.

It is an amenable number.

21442303189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442303189 is an equidigital number, since it uses as much as digits as its factorization.

21442303189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 21442303189 in words is "twenty-one billion, four hundred forty-two million, three hundred three thousand, one hundred eighty-nine".