21424526 has 8 divisors (see below), whose sum is σ = 32382504. Its totient is φ = 10630360.

The previous prime is 21424511. The next prime is 21424547. The reversal of 21424526 is 62542412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21424495 and 21424504.

It is a congruent number.

It is an unprimeable number.

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, 40625 + ... + 41148.

It is an arithmetic number, because the mean of its divisors is an integer number (4047813).

Almost surely, 2^21424526 is an apocalyptic number.

21424526 is a deficient number, since it is larger than the sum of its proper divisors (10957978).

21424526 is a wasteful number, since it uses less digits than its factorization.

21424526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81906.

The product of its digits is 3840, while the sum is 26.

The square root of 21424526 is about 4628.6635220115. The cubic root of 21424526 is about 277.7391321289.

Adding to 21424526 its reverse (62542412), we get a palindrome (83966938).

The spelling of 21424526 in words is "twenty-one million, four hundred twenty-four thousand, five hundred twenty-six".