21122111044 has 6 divisors (see below), whose sum is σ = 36963694334. Its totient is φ = 10561055520.

The previous prime is 21122111009. The next prime is 21122111047. The reversal of 21122111044 is 44011122112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17242316100 + 3879794944 = 131310^2 + 62288^2 .

It is a super-2 number, since 2×21122111044² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122111047) 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 as a sum of consecutive naturals, namely, 2640263877 + ... + 2640263884.

Almost surely, 2^21122111044 is an apocalyptic number.

It is an amenable number.

21122111044 is a deficient number, since it is larger than the sum of its proper divisors (15841583290).

21122111044 is a wasteful number, since it uses less digits than its factorization.

21122111044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280527765 (or 5280527763 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21122111044 its reverse (44011122112), we get a palindrome (65133233156).

The spelling of 21122111044 in words is "twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, forty-four".