21026026 has 8 divisors (see below), whose sum is σ = 36044640. Its totient is φ = 9011148.

The previous prime is 21025987. The next prime is 21026053. The reversal of 21026026 is 62062012.

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 = 21025994 and 21026012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750916 + ... + 750943.

It is an arithmetic number, because the mean of its divisors is an integer number (4505580).

Almost surely, 2^21026026 is an apocalyptic number.

21026026 is a deficient number, since it is larger than the sum of its proper divisors (15018614).

21026026 is a wasteful number, since it uses less digits than its factorization.

21026026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501868.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21026026 is about 4585.4144850820. The cubic root of 21026026 is about 276.0063448097.

Adding to 21026026 its reverse (62062012), we get a palindrome (83088038).

It can be divided in two parts, 2102 and 6026, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 21026026 in words is "twenty-one million, twenty-six thousand, twenty-six".