21044042230 has 32 divisors (see below), whose sum is σ = 40014920160. Its totient is φ = 7946184960.

The previous prime is 21044042219. The next prime is 21044042237. The reversal of 21044042230 is 3224044012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044042237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143689 + ... + 250468.

It is an arithmetic number, because the mean of its divisors is an integer number (1250466255).

Almost surely, 2^21044042230 is an apocalyptic number.

21044042230 is a deficient number, since it is larger than the sum of its proper divisors (18970877930).

21044042230 is a wasteful number, since it uses less digits than its factorization.

21044042230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394464.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21044042230 its reverse (3224044012), we get a palindrome (24268086242).

The spelling of 21044042230 in words is "twenty-one billion, forty-four million, forty-two thousand, two hundred thirty".