21412231 has 4 divisors (see below), whose sum is σ = 22671792. Its totient is φ = 20152672.

The previous prime is 21412219. The next prime is 21412267. The reversal of 21412231 is 13221412.

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

It is a cyclic number.

It is not a de Polignac number, because 21412231 - 2¹¹ = 21410183 is a prime.

It is a super-2 number, since 2×21412231² = 916967272794722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412631) 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, 629755 + ... + 629788.

It is an arithmetic number, because the mean of its divisors is an integer number (5667948).

Almost surely, 2^21412231 is an apocalyptic number.

21412231 is a deficient number, since it is larger than the sum of its proper divisors (1259561).

21412231 is a wasteful number, since it uses less digits than its factorization.

21412231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259560.

The product of its digits is 96, while the sum is 16.

The square root of 21412231 is about 4627.3351942560. The cubic root of 21412231 is about 277.6859927804.

Adding to 21412231 its reverse (13221412), we get a palindrome (34633643).

The spelling of 21412231 in words is "twenty-one million, four hundred twelve thousand, two hundred thirty-one".