21233026 has 4 divisors (see below), whose sum is σ = 31849542. Its totient is φ = 10616512.

The previous prime is 21233011. The next prime is 21233027. The reversal of 21233026 is 62033212.

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., 11215801 + 10017225 = 3349^2 + 3165^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21232994 and 21233012.

It is not an unprimeable number, because it can be changed into a prime (21233027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308255 + ... + 5308258.

Almost surely, 2^21233026 is an apocalyptic number.

21233026 is a deficient number, since it is larger than the sum of its proper divisors (10616516).

21233026 is a wasteful number, since it uses less digits than its factorization.

21233026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616515.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21233026 is about 4607.9307720494. The cubic root of 21233026 is about 276.9091440481.

Adding to 21233026 its reverse (62033212), we get a palindrome (83266238).

The spelling of 21233026 in words is "twenty-one million, two hundred thirty-three thousand, twenty-six".