21222150 has 24 divisors (see below), whose sum is σ = 52631304. Its totient is φ = 5659200.

The previous prime is 21222143. The next prime is 21222163. The reversal of 21222150 is 5122212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 70591 + ... + 70890.

It is an arithmetic number, because the mean of its divisors is an integer number (2192971).

Almost surely, 2^21222150 is an apocalyptic number.

21222150 is an abundant number, since it is smaller than the sum of its proper divisors (31409154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222150 is a wasteful number, since it uses less digits than its factorization.

21222150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141496 (or 141491 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21222150 is about 4606.7504816302. The cubic root of 21222150 is about 276.8618564216.

Adding to 21222150 its reverse (5122212), we get a palindrome (26344362).

The spelling of 21222150 in words is "twenty-one million, two hundred twenty-two thousand, one hundred fifty".