21126026 has 8 divisors (see below), whose sum is σ = 31721220. Its totient is φ = 10552288.

The previous prime is 21126023. The next prime is 21126031. The reversal of 21126026 is 62062112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20025625 + 1100401 = 4475^2 + 1049^2 .

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 = 21125989 and 21126007.

It is not an unprimeable number, because it can be changed into a prime (21126023) by changing a digit.

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, 2621 + ... + 7008.

Almost surely, 2^21126026 is an apocalyptic number.

21126026 is a deficient number, since it is larger than the sum of its proper divisors (10595194).

21126026 is a wasteful number, since it uses less digits than its factorization.

21126026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21126026 is about 4596.3056904431. The cubic root of 21126026 is about 276.4432159748.

Adding to 21126026 its reverse (62062112), we get a palindrome (83188138).

The spelling of 21126026 in words is "twenty-one million, one hundred twenty-six thousand, twenty-six".