21723336044 has 24 divisors (see below), whose sum is σ = 40103540400. Its totient is φ = 10267663680.

The previous prime is 21723336029. The next prime is 21723336053. The reversal of 21723336044 is 44063332712.

It is a junction number, because it is equal to n+sod(n) for n = 21723335995 and 21723336013.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274979 + ... + 345050.

It is an arithmetic number, because the mean of its divisors is an integer number (1670980850).

Almost surely, 2^21723336044 is an apocalyptic number.

It is an amenable number.

21723336044 is a deficient number, since it is larger than the sum of its proper divisors (18380204356).

21723336044 is a wasteful number, since it uses less digits than its factorization.

21723336044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620513 (or 620511 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 35.

Adding to 21723336044 its reverse (44063332712), we get a palindrome (65786668756).

The spelling of 21723336044 in words is "twenty-one billion, seven hundred twenty-three million, three hundred thirty-six thousand, forty-four".