21103220044 has 24 divisors (see below), whose sum is σ = 37838350368. Its totient is φ = 10292357760.

The previous prime is 21103220041. The next prime is 21103220057. The reversal of 21103220044 is 44002230112.

It is not an unprimeable number, because it can be changed into a prime (21103220041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373734 + ... + 1389010.

It is an arithmetic number, because the mean of its divisors is an integer number (1576597932).

Almost surely, 2^21103220044 is an apocalyptic number.

It is an amenable number.

21103220044 is a deficient number, since it is larger than the sum of its proper divisors (16735130324).

21103220044 is a wasteful number, since it uses less digits than its factorization.

21103220044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23745 (or 23743 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21103220044 its reverse (44002230112), we get a palindrome (65105450156).

The spelling of 21103220044 in words is "twenty-one billion, one hundred three million, two hundred twenty thousand, forty-four".