21201622 has 16 divisors (see below), whose sum is σ = 34573392. Its totient is φ = 9692640.

The previous prime is 21201619. The next prime is 21201637. The reversal of 21201622 is 22610212.

It is a junction number, because it is equal to n+sod(n) for n = 21201596 and 21201605.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1029 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (2160837).

Almost surely, 2^21201622 is an apocalyptic number.

21201622 is a deficient number, since it is larger than the sum of its proper divisors (13371770).

21201622 is a wasteful number, since it uses less digits than its factorization.

21201622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7743.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21201622 is about 4604.5219078641. The cubic root of 21201622 is about 276.7725589395.

Adding to 21201622 its reverse (22610212), we get a palindrome (43811834).

The spelling of 21201622 in words is "twenty-one million, two hundred one thousand, six hundred twenty-two".