21222350 has 24 divisors (see below), whose sum is σ = 39606840. Its totient is φ = 8460320.

The previous prime is 21222347. The next prime is 21222361. The reversal of 21222350 is 5322212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20444 + ... + 21456.

It is an arithmetic number, because the mean of its divisors is an integer number (1650285).

Almost surely, 2^21222350 is an apocalyptic number.

21222350 is a deficient number, since it is larger than the sum of its proper divisors (18384490).

21222350 is a wasteful number, since it uses less digits than its factorization.

21222350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21222350 is about 4606.7721888541. The cubic root of 21222350 is about 276.8627261450.

Adding to 21222350 its reverse (5322212), we get a palindrome (26544562).

The spelling of 21222350 in words is "twenty-one million, two hundred twenty-two thousand, three hundred fifty".