21054353 has 2 divisors, whose sum is σ = 21054354. Its totient is φ = 21054352.

The previous prime is 21054343. The next prime is 21054373. The reversal of 21054353 is 35345012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 8720209 = 3512^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054353 - 2⁶ = 21054289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21054323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527176 + 10527177.

It is an arithmetic number, because the mean of its divisors is an integer number (10527177).

Almost surely, 2^21054353 is an apocalyptic number.

It is an amenable number.

21054353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054353 is an equidigital number, since it uses as much as digits as its factorization.

21054353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21054353 is about 4588.5022610869. The cubic root of 21054353 is about 276.1302376662.

Adding to 21054353 its reverse (35345012), we get a palindrome (56399365).

The spelling of 21054353 in words is "twenty-one million, fifty-four thousand, three hundred fifty-three".