21226535 has 16 divisors (see below), whose sum is σ = 27965952. Its totient is φ = 15338400.

The previous prime is 21226531. The next prime is 21226547. The reversal of 21226535 is 53562212.

It is not a de Polignac number, because 21226535 - 2² = 21226531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8030 + ... + 10340.

It is an arithmetic number, because the mean of its divisors is an integer number (1747872).

Almost surely, 2^21226535 is an apocalyptic number.

21226535 is a deficient number, since it is larger than the sum of its proper divisors (6739417).

21226535 is a wasteful number, since it uses less digits than its factorization.

21226535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494.

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

The square root of 21226535 is about 4607.2263890545. The cubic root of 21226535 is about 276.8809238525.

Adding to 21226535 its reverse (53562212), we get a palindrome (74788747).

The spelling of 21226535 in words is "twenty-one million, two hundred twenty-six thousand, five hundred thirty-five".