21432422 has 16 divisors (see below), whose sum is σ = 35928144. Its totient is φ = 9504000.

The previous prime is 21432413. The next prime is 21432443. The reversal of 21432422 is 22423412.

It is a junction number, because it is equal to n+sod(n) for n = 21432394 and 21432403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10979 + ... + 12782.

It is an arithmetic number, because the mean of its divisors is an integer number (2245509).

Almost surely, 2^21432422 is an apocalyptic number.

21432422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21432422 is a deficient number, since it is larger than the sum of its proper divisors (14495722).

21432422 is a wasteful number, since it uses less digits than its factorization.

21432422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23815.

The product of its digits is 768, while the sum is 20.

The square root of 21432422 is about 4629.5163894299. The cubic root of 21432422 is about 277.7732481513.

Adding to 21432422 its reverse (22423412), we get a palindrome (43855834).

The spelling of 21432422 in words is "twenty-one million, four hundred thirty-two thousand, four hundred twenty-two".