21442235 has 8 divisors (see below), whose sum is σ = 26560896. Its totient is φ = 16600320.

The previous prime is 21442229. The next prime is 21442243. The reversal of 21442235 is 53224412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21442235 - 2¹⁴ = 21425851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21442235.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69014 + ... + 69323.

It is an arithmetic number, because the mean of its divisors is an integer number (3320112).

Almost surely, 2^21442235 is an apocalyptic number.

21442235 is a deficient number, since it is larger than the sum of its proper divisors (5118661).

21442235 is a wasteful number, since it uses less digits than its factorization.

21442235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138373.

The product of its digits is 1920, while the sum is 23.

The square root of 21442235 is about 4630.5760980681. The cubic root of 21442235 is about 277.8156352255.

Adding to 21442235 its reverse (53224412), we get a palindrome (74666647).

The spelling of 21442235 in words is "twenty-one million, four hundred forty-two thousand, two hundred thirty-five".