21153359 has 2 divisors, whose sum is σ = 21153360. Its totient is φ = 21153358.

The previous prime is 21153347. The next prime is 21153361. The reversal of 21153359 is 95335112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21153359 - 2²⁴ = 4376143 is a prime.

Together with 21153361, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21153259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576679 + 10576680.

It is an arithmetic number, because the mean of its divisors is an integer number (10576680).

Almost surely, 2^21153359 is an apocalyptic number.

21153359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153359 is an equidigital number, since it uses as much as digits as its factorization.

21153359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4050, while the sum is 29.

The square root of 21153359 is about 4599.2780955276. The cubic root of 21153359 is about 276.5623859831.

It can be divided in two parts, 21153 and 359, that added together give a palindrome (21512).

The spelling of 21153359 in words is "twenty-one million, one hundred fifty-three thousand, three hundred fifty-nine".