21024026 has 4 divisors (see below), whose sum is σ = 31536042. Its totient is φ = 10512012.

The previous prime is 21023971. The next prime is 21024067. The reversal of 21024026 is 62042012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20693401 + 330625 = 4549^2 + 575^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21023995 and 21024013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5256005 + ... + 5256008.

Almost surely, 2^21024026 is an apocalyptic number.

21024026 is a deficient number, since it is larger than the sum of its proper divisors (10512016).

21024026 is a wasteful number, since it uses less digits than its factorization.

21024026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512015.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21024026 is about 4585.1963971023. The cubic root of 21024026 is about 275.9975932717.

Adding to 21024026 its reverse (62042012), we get a palindrome (83066038).

The spelling of 21024026 in words is "twenty-one million, twenty-four thousand, twenty-six".