21522026 has 4 divisors (see below), whose sum is σ = 32283042. Its totient is φ = 10761012.

The previous prime is 21522001. The next prime is 21522037. The reversal of 21522026 is 62022512.

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., 18913801 + 2608225 = 4349^2 + 1615^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21521989 and 21522007.

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 as a sum of consecutive naturals, namely, 5380505 + ... + 5380508.

Almost surely, 2^21522026 is an apocalyptic number.

21522026 is a deficient number, since it is larger than the sum of its proper divisors (10761016).

21522026 is a wasteful number, since it uses less digits than its factorization.

21522026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10761015.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21522026 is about 4639.1837644137. The cubic root of 21522026 is about 278.1598118442.

Adding to 21522026 its reverse (62022512), we get a palindrome (83544538).

The spelling of 21522026 in words is "twenty-one million, five hundred twenty-two thousand, twenty-six".