21044042212 has 24 divisors (see below), whose sum is σ = 40337975160. Its totient is φ = 9561592320.

The previous prime is 21044042209. The next prime is 21044042219. The reversal of 21044042212 is 21224044012.

It can be written as a sum of positive squares in 4 ways, for example, as 8762083236 + 12281958976 = 93606^2 + 110824^2 .

It is not an unprimeable number, because it can be changed into a prime (21044042219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5333739 + ... + 5337682.

It is an arithmetic number, because the mean of its divisors is an integer number (1680748965).

Almost surely, 2^21044042212 is an apocalyptic number.

It is an amenable number.

21044042212 is a deficient number, since it is larger than the sum of its proper divisors (19293932948).

21044042212 is a wasteful number, since it uses less digits than its factorization.

21044042212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10671471 (or 10671469 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21044042212 its reverse (21224044012), we get a palindrome (42268086224).

The spelling of 21044042212 in words is "twenty-one billion, forty-four million, forty-two thousand, two hundred twelve".