20421104444 has 48 divisors (see below), whose sum is σ = 39180721440. Its totient is φ = 9255479040.

The previous prime is 20421104437. The next prime is 20421104467. The reversal of 20421104444 is 44440112402.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2066387 + ... + 2076245.

It is an arithmetic number, because the mean of its divisors is an integer number (816265030).

Almost surely, 2^20421104444 is an apocalyptic number.

It is an amenable number.

20421104444 is a deficient number, since it is larger than the sum of its proper divisors (18759616996).

20421104444 is a wasteful number, since it uses less digits than its factorization.

20421104444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590 (or 10588 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 20421104444 its reverse (44440112402), we get a palindrome (64861216846).

The spelling of 20421104444 in words is "twenty billion, four hundred twenty-one million, one hundred four thousand, four hundred forty-four".