21119346389 has 2 divisors, whose sum is σ = 21119346390. Its totient is φ = 21119346388.

The previous prime is 21119346361. The next prime is 21119346427. The reversal of 21119346389 is 98364391112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14651165764 + 6468180625 = 121042^2 + 80425^2 .

It is a cyclic number.

It is not a de Polignac number, because 21119346389 - 2²⁰ = 21118297813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21119346359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10559673194 + 10559673195.

It is an arithmetic number, because the mean of its divisors is an integer number (10559673195).

Almost surely, 2^21119346389 is an apocalyptic number.

It is an amenable number.

21119346389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21119346389 is an equidigital number, since it uses as much as digits as its factorization.

21119346389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The spelling of 21119346389 in words is "twenty-one billion, one hundred nineteen million, three hundred forty-six thousand, three hundred eighty-nine".