21828353 has 2 divisors, whose sum is σ = 21828354. Its totient is φ = 21828352.

The previous prime is 21828349. The next prime is 21828383. The reversal of 21828353 is 35382812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21003889 + 824464 = 4583^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 21828353 - 2² = 21828349 is a prime.

It is not a weakly prime, because it can be changed into another prime (21828383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10914176 + 10914177.

It is an arithmetic number, because the mean of its divisors is an integer number (10914177).

Almost surely, 2^21828353 is an apocalyptic number.

It is an amenable number.

21828353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21828353 is an equidigital number, since it uses as much as digits as its factorization.

21828353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 21828353 is about 4672.0822980765. The cubic root of 21828353 is about 279.4732998262.

The spelling of 21828353 in words is "twenty-one million, eight hundred twenty-eight thousand, three hundred fifty-three".