21412263 has 4 divisors (see below), whose sum is σ = 28549688. Its totient is φ = 14274840.

The previous prime is 21412219. The next prime is 21412267. The reversal of 21412263 is 36221412.

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

It is not a de Polignac number, because 21412263 - 2¹⁰ = 21411239 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 (21412267) 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, 3568708 + ... + 3568713.

It is an arithmetic number, because the mean of its divisors is an integer number (7137422).

Almost surely, 2^21412263 is an apocalyptic number.

21412263 is a deficient number, since it is larger than the sum of its proper divisors (7137425).

21412263 is an equidigital number, since it uses as much as digits as its factorization.

21412263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7137424.

The product of its digits is 576, while the sum is 21.

The square root of 21412263 is about 4627.3386519683. The cubic root of 21412263 is about 277.6861311117.

Adding to 21412263 its reverse (36221412), we get a palindrome (57633675).

It can be divided in two parts, 214122 and 63, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 21412263 in words is "twenty-one million, four hundred twelve thousand, two hundred sixty-three".