21442353 has 4 divisors (see below), whose sum is σ = 28589808. Its totient is φ = 14294900.

The previous prime is 21442349. The next prime is 21442357. The reversal of 21442353 is 35324412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21442349) and next prime (21442357).

It is a cyclic number.

It is not a de Polignac number, because 21442353 - 2² = 21442349 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21442357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3573723 + ... + 3573728.

It is an arithmetic number, because the mean of its divisors is an integer number (7147452).

Almost surely, 2^21442353 is an apocalyptic number.

It is an amenable number.

21442353 is a deficient number, since it is larger than the sum of its proper divisors (7147455).

21442353 is an equidigital number, since it uses as much as digits as its factorization.

21442353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7147454.

The product of its digits is 2880, while the sum is 24.

The square root of 21442353 is about 4630.5888394458. The cubic root of 21442353 is about 277.8161448456.

Adding to 21442353 its reverse (35324412), we get a palindrome (56766765).

The spelling of 21442353 in words is "twenty-one million, four hundred forty-two thousand, three hundred fifty-three".