19211120389 has 2 divisors, whose sum is σ = 19211120390. Its totient is φ = 19211120388.

The previous prime is 19211120387. The next prime is 19211120407. The reversal of 19211120389 is 98302111291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19207188100 + 3932289 = 138590^2 + 1983^2 .

It is an emirp because it is prime and its reverse (98302111291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19211120389 - 2¹ = 19211120387 is a prime.

It is a super-2 number, since 2×19211120389² (a number of 21 digits) contains 22 as substring.

Together with 19211120387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19211120387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9605560194 + 9605560195.

It is an arithmetic number, because the mean of its divisors is an integer number (9605560195).

Almost surely, 2^19211120389 is an apocalyptic number.

It is an amenable number.

19211120389 is a deficient number, since it is larger than the sum of its proper divisors (1).

19211120389 is an equidigital number, since it uses as much as digits as its factorization.

19211120389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 19211120389 in words is "nineteen billion, two hundred eleven million, one hundred twenty thousand, three hundred eighty-nine".