21535226 has 16 divisors (see below), whose sum is σ = 35384040. Its totient is φ = 9784320.

The previous prime is 21535187. The next prime is 21535231. The reversal of 21535226 is 62253512.

It can be written as a sum of positive squares in 4 ways, for example, as 14250625 + 7284601 = 3775^2 + 2699^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21535195 and 21535204.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 9935 + ... + 11906.

Almost surely, 2^21535226 is an apocalyptic number.

21535226 is a deficient number, since it is larger than the sum of its proper divisors (13848814).

21535226 is a wasteful number, since it uses less digits than its factorization.

21535226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21889.

The product of its digits is 3600, while the sum is 26.

The square root of 21535226 is about 4640.6062103997. The cubic root of 21535226 is about 278.2166676923.

Adding to 21535226 its reverse (62253512), we get a palindrome (83788738).

The spelling of 21535226 in words is "twenty-one million, five hundred thirty-five thousand, two hundred twenty-six".