21413223 has 24 divisors (see below), whose sum is σ = 34463520. Its totient is φ = 12720960.

The previous prime is 21413221. The next prime is 21413243. The reversal of 21413223 is 32231412.

It is not a de Polignac number, because 21413223 - 2¹ = 21413221 is a prime.

It is a super-2 number, since 2×21413223² = 917052238495458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21413196 and 21413205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (1435980).

Almost surely, 2^21413223 is an apocalyptic number.

21413223 is a deficient number, since it is larger than the sum of its proper divisors (13050297).

21413223 is a wasteful number, since it uses less digits than its factorization.

21413223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359 (or 6356 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21413223 is about 4627.4423821372. The cubic root of 21413223 is about 277.6902809876.

Adding to 21413223 its reverse (32231412), we get a palindrome (53644635).

The spelling of 21413223 in words is "twenty-one million, four hundred thirteen thousand, two hundred twenty-three".