21389059 has 2 divisors, whose sum is σ = 21389060. Its totient is φ = 21389058.

The previous prime is 21389021. The next prime is 21389063. The reversal of 21389059 is 95098312.

21389059 is nontrivially palindromic in base 12.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21389059 - 2¹³ = 21380867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21389359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694529 + 10694530.

It is an arithmetic number, because the mean of its divisors is an integer number (10694530).

Almost surely, 2^21389059 is an apocalyptic number.

21389059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389059 is an equidigital number, since it uses as much as digits as its factorization.

21389059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 21389059 is about 4624.8306996040. The cubic root of 21389059 is about 277.5857873987.

The spelling of 21389059 in words is "twenty-one million, three hundred eighty-nine thousand, fifty-nine".