21050026 has 4 divisors (see below), whose sum is σ = 31575042. Its totient is φ = 10525012.

The previous prime is 21050017. The next prime is 21050033. The reversal of 21050026 is 62005012.

It is a happy number.

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., 15217801 + 5832225 = 3901^2 + 2415^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21049991 and 21050009.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5262505 + ... + 5262508.

Almost surely, 2^21050026 is an apocalyptic number.

21050026 is a deficient number, since it is larger than the sum of its proper divisors (10525016).

21050026 is a wasteful number, since it uses less digits than its factorization.

21050026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10525015.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21050026 is about 4588.0307322423. The cubic root of 21050026 is about 276.1113200042. Note that the first 3 decimals are identical.

Adding to 21050026 its reverse (62005012), we get a palindrome (83055038).

The spelling of 21050026 in words is "twenty-one million, fifty thousand, twenty-six".