21279059 has 2 divisors, whose sum is σ = 21279060. Its totient is φ = 21279058.

The previous prime is 21279047. The next prime is 21279061. The reversal of 21279059 is 95097212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21279059 - 2²⁴ = 4501843 is a prime.

Together with 21279061, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21279029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10639529 + 10639530.

It is an arithmetic number, because the mean of its divisors is an integer number (10639530).

Almost surely, 2^21279059 is an apocalyptic number.

21279059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21279059 is an equidigital number, since it uses as much as digits as its factorization.

21279059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 21279059 is about 4612.9230429306. The cubic root of 21279059 is about 277.1091117454.

The spelling of 21279059 in words is "twenty-one million, two hundred seventy-nine thousand, fifty-nine".