21203422 has 4 divisors (see below), whose sum is σ = 31805136. Its totient is φ = 10601710.

The previous prime is 21203419. The next prime is 21203431. The reversal of 21203422 is 22430212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21203396 and 21203405.

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 as a sum of consecutive naturals, namely, 5300854 + ... + 5300857.

It is an arithmetic number, because the mean of its divisors is an integer number (7951284).

Almost surely, 2^21203422 is an apocalyptic number.

21203422 is a deficient number, since it is larger than the sum of its proper divisors (10601714).

21203422 is a wasteful number, since it uses less digits than its factorization.

21203422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601713.

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

The square root of 21203422 is about 4604.7173637477. The cubic root of 21203422 is about 276.7803913042.

Adding to 21203422 its reverse (22430212), we get a palindrome (43633634).

The spelling of 21203422 in words is "twenty-one million, two hundred three thousand, four hundred twenty-two".