21303122 has 16 divisors (see below), whose sum is σ = 32519232. Its totient is φ = 10465200.

The previous prime is 21303109. The next prime is 21303127. The reversal of 21303122 is 22130312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21303097 and 21303106.

It is not an unprimeable number, because it can be changed into a prime (21303127) 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 7 ways as a sum of consecutive naturals, for example, 32603 + ... + 33249.

It is an arithmetic number, because the mean of its divisors is an integer number (2032452).

Almost surely, 2^21303122 is an apocalyptic number.

21303122 is a deficient number, since it is larger than the sum of its proper divisors (11216110).

21303122 is a wasteful number, since it uses less digits than its factorization.

21303122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21303122 is about 4615.5305220527. The cubic root of 21303122 is about 277.2135268364.

Adding to 21303122 its reverse (22130312), we get a palindrome (43433434).

It can be divided in two parts, 2130312 and 2, that multiplied together give a palindrome (4260624).

The spelling of 21303122 in words is "twenty-one million, three hundred three thousand, one hundred twenty-two".