21044122042 has 16 divisors (see below), whose sum is σ = 31718921832. Its totient is φ = 10471265280.

The previous prime is 21044121983. The next prime is 21044122051. The reversal of 21044122042 is 24022144012.

It can be written as a sum of positive squares in 4 ways, for example, as 13110479001 + 7933643041 = 114501^2 + 89071^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 335778 + ... + 393490.

Almost surely, 2^21044122042 is an apocalyptic number.

21044122042 is a deficient number, since it is larger than the sum of its proper divisors (10674799790).

21044122042 is a wasteful number, since it uses less digits than its factorization.

21044122042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58593.

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

Adding to 21044122042 its reverse (24022144012), we get a palindrome (45066266054).

The spelling of 21044122042 in words is "twenty-one billion, forty-four million, one hundred twenty-two thousand, forty-two".