21430222 has 16 divisors (see below), whose sum is σ = 35305344. Its totient is φ = 9675000.

The previous prime is 21430193. The next prime is 21430229. The reversal of 21430222 is 22203412.

It is a junction number, because it is equal to n+sod(n) for n = 21430196 and 21430205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (2206584).

Almost surely, 2^21430222 is an apocalyptic number.

21430222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21430222 is a deficient number, since it is larger than the sum of its proper divisors (13875122).

21430222 is a wasteful number, since it uses less digits than its factorization.

21430222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21430222 is about 4629.2787775203. The cubic root of 21430222 is about 277.7637435161.

Adding to 21430222 its reverse (22203412), we get a palindrome (43633634).

The spelling of 21430222 in words is "twenty-one million, four hundred thirty thousand, two hundred twenty-two".