21026524 has 12 divisors (see below), whose sum is σ = 36835848. Its totient is φ = 10502000.

The previous prime is 21026519. The next prime is 21026549. The reversal of 21026524 is 42562012.

It is a super-2 number, since 2×21026524² = 884229423045152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21026495 and 21026504.

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, 2499 + ... + 6949.

It is an arithmetic number, because the mean of its divisors is an integer number (3069654).

Almost surely, 2^21026524 is an apocalyptic number.

It is an amenable number.

21026524 is a deficient number, since it is larger than the sum of its proper divisors (15809324).

21026524 is a wasteful number, since it uses less digits than its factorization.

21026524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636 (or 5634 counting only the distinct ones).

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

The square root of 21026524 is about 4585.4687873761. The cubic root of 21026524 is about 276.0085238563.

Adding to 21026524 its reverse (42562012), we get a palindrome (63588536).

The spelling of 21026524 in words is "twenty-one million, twenty-six thousand, five hundred twenty-four".