21526222 has 4 divisors (see below), whose sum is σ = 32289336. Its totient is φ = 10763110.

The previous prime is 21526213. The next prime is 21526237. The reversal of 21526222 is 22262512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21526193 and 21526202.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5381554 + ... + 5381557.

It is an arithmetic number, because the mean of its divisors is an integer number (8072334).

Almost surely, 2^21526222 is an apocalyptic number.

21526222 is a deficient number, since it is larger than the sum of its proper divisors (10763114).

21526222 is a wasteful number, since it uses less digits than its factorization.

21526222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10763113.

The product of its digits is 960, while the sum is 22.

The square root of 21526222 is about 4639.6359770999. The cubic root of 21526222 is about 278.1778876321.

Adding to 21526222 its reverse (22262512), we get a palindrome (43788734).

The spelling of 21526222 in words is "twenty-one million, five hundred twenty-six thousand, two hundred twenty-two".