21423341 has 4 divisors (see below), whose sum is σ = 21541884. Its totient is φ = 21304800.

The previous prime is 21423319. The next prime is 21423343. The reversal of 21423341 is 14332412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11526025 + 9897316 = 3395^2 + 3146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21423341 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 (21423343) 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, 59000 + ... + 59361.

It is an arithmetic number, because the mean of its divisors is an integer number (5385471).

Almost surely, 2^21423341 is an apocalyptic number.

It is an amenable number.

21423341 is a deficient number, since it is larger than the sum of its proper divisors (118543).

21423341 is a wasteful number, since it uses less digits than its factorization.

21423341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118542.

The product of its digits is 576, while the sum is 20.

The square root of 21423341 is about 4628.5355135291. The cubic root of 21423341 is about 277.7340114098.

Adding to 21423341 its reverse (14332412), we get a palindrome (35755753).

The spelling of 21423341 in words is "twenty-one million, four hundred twenty-three thousand, three hundred forty-one".