21044023330 has 32 divisors (see below), whose sum is σ = 41476484160. Its totient is φ = 7623913920.

The previous prime is 21044023327. The next prime is 21044023331. The reversal of 21044023330 is 3332044012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21044023331) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 326004 + ... + 385183.

It is an arithmetic number, because the mean of its divisors is an integer number (1296140130).

Almost surely, 2^21044023330 is an apocalyptic number.

21044023330 is a deficient number, since it is larger than the sum of its proper divisors (20432460830).

21044023330 is a wasteful number, since it uses less digits than its factorization.

21044023330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711474.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21044023330 its reverse (3332044012), we get a palindrome (24376067342).

The spelling of 21044023330 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred thirty".