21411423 has 24 divisors (see below), whose sum is σ = 35518080. Its totient is φ = 12292560.

The previous prime is 21411407. The next prime is 21411431. The reversal of 21411423 is 32411412.

It is not a de Polignac number, because 21411423 - 2⁴ = 21411407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21411396 and 21411405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411433) 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, 3811 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (1479920).

Almost surely, 2^21411423 is an apocalyptic number.

21411423 is a deficient number, since it is larger than the sum of its proper divisors (14106657).

21411423 is a wasteful number, since it uses less digits than its factorization.

21411423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11419 (or 11416 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21411423 is about 4627.2478861630. The cubic root of 21411423 is about 277.6824998686.

Adding to 21411423 its reverse (32411412), we get a palindrome (53822835).

The spelling of 21411423 in words is "twenty-one million, four hundred eleven thousand, four hundred twenty-three".