21389119 has 2 divisors, whose sum is σ = 21389120. Its totient is φ = 21389118.

The previous prime is 21389107. The next prime is 21389141. The reversal of 21389119 is 91198312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21389119 - 2⁵ = 21389087 is a prime.

It is a super-2 number, since 2×21389119² = 914988823192322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21389419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694559 + 10694560.

It is an arithmetic number, because the mean of its divisors is an integer number (10694560).

Almost surely, 2^21389119 is an apocalyptic number.

21389119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389119 is an equidigital number, since it uses as much as digits as its factorization.

21389119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 21389119 is about 4624.8371863234. The cubic root of 21389119 is about 277.5860469571.

The spelling of 21389119 in words is "twenty-one million, three hundred eighty-nine thousand, one hundred nineteen".