21003922 has 8 divisors (see below), whose sum is σ = 32875776. Its totient is φ = 10045332.

The previous prime is 21003893. The next prime is 21003929. The reversal of 21003922 is 22930012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21003922.

It is not an unprimeable number, because it can be changed into a prime (21003929) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 228258 + ... + 228349.

It is an arithmetic number, because the mean of its divisors is an integer number (4109472).

Almost surely, 2^21003922 is an apocalyptic number.

21003922 is a deficient number, since it is larger than the sum of its proper divisors (11871854).

21003922 is a wasteful number, since it uses less digits than its factorization.

21003922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456632.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21003922 is about 4583.0036002604. The cubic root of 21003922 is about 275.9095919668.

Adding to 21003922 its reverse (22930012), we get a palindrome (43933934).

The spelling of 21003922 in words is "twenty-one million, three thousand, nine hundred twenty-two".