21111111044 has 12 divisors (see below), whose sum is σ = 36951742464. Its totient is φ = 10553470344.

The previous prime is 21111111031. The next prime is 21111111059. The reversal of 21111111044 is 44011111112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498404 + ... + 539099.

It is an arithmetic number, because the mean of its divisors is an integer number (3079311872).

Almost surely, 2^21111111044 is an apocalyptic number.

It is an amenable number.

21111111044 is a deficient number, since it is larger than the sum of its proper divisors (15840631420).

21111111044 is a wasteful number, since it uses less digits than its factorization.

21111111044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042594 (or 1042592 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111111044 its reverse (44011111112), we get a palindrome (65122222156).

The spelling of 21111111044 in words is "twenty-one billion, one hundred eleven million, one hundred eleven thousand, forty-four".