21143222 has 16 divisors (see below), whose sum is σ = 32247072. Its totient is φ = 10395840.

The previous prime is 21143207. The next prime is 21143251. The reversal of 21143222 is 22234112.

It is a super-3 number, since 3×21143222³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21143222.

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 7 ways as a sum of consecutive naturals, for example, 40322 + ... + 40842.

It is an arithmetic number, because the mean of its divisors is an integer number (2015442).

Almost surely, 2^21143222 is an apocalyptic number.

21143222 is a deficient number, since it is larger than the sum of its proper divisors (11103850).

21143222 is a wasteful number, since it uses less digits than its factorization.

21143222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823.

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

The square root of 21143222 is about 4598.1759426973. The cubic root of 21143222 is about 276.5182013400.

Adding to 21143222 its reverse (22234112), we get a palindrome (43377334).

The spelling of 21143222 in words is "twenty-one million, one hundred forty-three thousand, two hundred twenty-two".