21420526 has 8 divisors (see below), whose sum is σ = 32150664. Its totient is φ = 10703640.

The previous prime is 21420499. The next prime is 21420541. The reversal of 21420526 is 62502412.

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 = 21420497 and 21420506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3696 + ... + 7516.

It is an arithmetic number, because the mean of its divisors is an integer number (4018833).

Almost surely, 2^21420526 is an apocalyptic number.

21420526 is a deficient number, since it is larger than the sum of its proper divisors (10730138).

21420526 is a wasteful number, since it uses less digits than its factorization.

21420526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21420526 is about 4628.2314116734. The cubic root of 21420526 is about 277.7218462439.

Adding to 21420526 its reverse (62502412), we get a palindrome (83922938).

The spelling of 21420526 in words is "twenty-one million, four hundred twenty thousand, five hundred twenty-six".