21942353 has 4 divisors (see below), whose sum is σ = 22026048. Its totient is φ = 21858660.

The previous prime is 21942317. The next prime is 21942377. The reversal of 21942353 is 35324912.

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 a cyclic number.

It is not a de Polignac number, because 21942353 - 2⁶ = 21942289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21942313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41453 + ... + 41978.

It is an arithmetic number, because the mean of its divisors is an integer number (5506512).

Almost surely, 2^21942353 is an apocalyptic number.

It is an amenable number.

21942353 is a deficient number, since it is larger than the sum of its proper divisors (83695).

21942353 is an equidigital number, since it uses as much as digits as its factorization.

21942353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83694.

The product of its digits is 6480, while the sum is 29.

The square root of 21942353 is about 4684.2665381039. The cubic root of 21942353 is about 279.9589778338.

The spelling of 21942353 in words is "twenty-one million, nine hundred forty-two thousand, three hundred fifty-three".