21220022 has 8 divisors (see below), whose sum is σ = 32021136. Its totient is φ = 10546312.

The previous prime is 21220019. The next prime is 21220103. The reversal of 21220022 is 22002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21219985 and 21220012.

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 in 3 ways as a sum of consecutive naturals, for example, 31433 + ... + 32100.

It is an arithmetic number, because the mean of its divisors is an integer number (4002642).

Almost surely, 2^21220022 is an apocalyptic number.

21220022 is a deficient number, since it is larger than the sum of its proper divisors (10801114).

21220022 is a wasteful number, since it uses less digits than its factorization.

21220022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63702.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21220022 is about 4606.5195104330. The cubic root of 21220022 is about 276.8526022269.

Adding to 21220022 its reverse (22002212), we get a palindrome (43222234).

The spelling of 21220022 in words is "twenty-one million, two hundred twenty thousand, twenty-two".