21123341 has 4 divisors (see below), whose sum is σ = 21137952.
Its totient is φ = 21108732.
The previous prime is 21123331. The next prime is 21123359. The reversal of 21123341 is 14332112.
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 21123341 - 214 = 21106957 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21123301) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4865 + ... + 8118.
It is an arithmetic number, because the mean of its divisors is an integer number (5284488).
Almost surely, 221123341 is an apocalyptic number.
It is an amenable number.
21123341 is a deficient number, since it is larger than the sum of its proper divisors (14611).
21123341 is a wasteful number, since it uses less digits than its factorization.
21123341 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 14610.
The product of its digits is 144, while the sum is 17.
The square root of 21123341 is about 4596.0135987614.
The cubic root of 21123341 is about 276.4315040153.
Adding to 21123341 its reverse (14332112), we get a palindrome (35455453).
The spelling of 21123341 in words is "twenty-one million, one hundred twenty-three thousand, three hundred forty-one".