21330126 has 24 divisors (see below), whose sum is σ = 46477704. Its totient is φ = 7069680.

The previous prime is 21330119. The next prime is 21330149. The reversal of 21330126 is 62103312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21330099 and 21330108.

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 in 11 ways as a sum of consecutive naturals, for example, 16 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (1936571).

Almost surely, 2^21330126 is an apocalyptic number.

21330126 is an abundant number, since it is smaller than the sum of its proper divisors (25147578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21330126 is a wasteful number, since it uses less digits than its factorization.

21330126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736 (or 6733 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21330126 is about 4618.4549364479. The cubic root of 21330126 is about 277.3306100391.

Adding to 21330126 its reverse (62103312), we get a palindrome (83433438).

The spelling of 21330126 in words is "twenty-one million, three hundred thirty thousand, one hundred twenty-six".