21723346044 has 48 divisors (see below), whose sum is σ = 57518092800. Its totient is φ = 7087047408.

The previous prime is 21723346031. The next prime is 21723346049. The reversal of 21723346044 is 44064332712.

21723346044 is a `hidden beast` number, since 2 + 17 + 2 + 3 + 34 + 604 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723346049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2134734 + ... + 2144885.

It is an arithmetic number, because the mean of its divisors is an integer number (1198293600).

Almost surely, 2^21723346044 is an apocalyptic number.

It is an amenable number.

21723346044 is an abundant number, since it is smaller than the sum of its proper divisors (35794746756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21723346044 is a wasteful number, since it uses less digits than its factorization.

21723346044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279679 (or 4279671 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

Adding to 21723346044 its reverse (44064332712), we get a palindrome (65787678756).

The spelling of 21723346044 in words is "twenty-one billion, seven hundred twenty-three million, three hundred forty-six thousand, forty-four".