21222026 has 32 divisors (see below), whose sum is σ = 37981440. Its totient is φ = 8701056.

The previous prime is 21222023. The next prime is 21222037. The reversal of 21222026 is 62022212.

It is a junction number, because it is equal to n+sod(n) for n = 21221995 and 21222013.

It is not an unprimeable number, because it can be changed into a prime (21222023) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 67646 + ... + 67958.

It is an arithmetic number, because the mean of its divisors is an integer number (1186920).

Almost surely, 2^21222026 is an apocalyptic number.

21222026 is a deficient number, since it is larger than the sum of its proper divisors (16759414).

21222026 is a wasteful number, since it uses less digits than its factorization.

21222026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21222026 is about 4606.7370231000. The cubic root of 21222026 is about 276.8613171904.

Adding to 21222026 its reverse (62022212), we get a palindrome (83244238).

The spelling of 21222026 in words is "twenty-one million, two hundred twenty-two thousand, twenty-six".