21273359 has 2 divisors, whose sum is σ = 21273360. Its totient is φ = 21273358.

The previous prime is 21273349. The next prime is 21273391. The reversal of 21273359 is 95337212.

It is an a-pointer prime, because the next prime (21273391) can be obtained adding 21273359 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21273359 - 2¹² = 21269263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21273319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636679 + 10636680.

It is an arithmetic number, because the mean of its divisors is an integer number (10636680).

Almost surely, 2^21273359 is an apocalyptic number.

21273359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21273359 is an equidigital number, since it uses as much as digits as its factorization.

21273359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 21273359 is about 4612.3051720371. The cubic root of 21273359 is about 277.0843665567.

The spelling of 21273359 in words is "twenty-one million, two hundred seventy-three thousand, three hundred fifty-nine".