21323125044 has 96 divisors (see below), whose sum is σ = 59599774080. Its totient is φ = 6553785600.

The previous prime is 21323125027. The next prime is 21323125051. The reversal of 21323125044 is 44052132312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21323124999 and 21323125017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1355464 + ... + 1371104.

It is an arithmetic number, because the mean of its divisors is an integer number (620830980).

Almost surely, 2^21323125044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323125044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29799887040).

21323125044 is an abundant number, since it is smaller than the sum of its proper divisors (38276649036).

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

21323125044 is a wasteful number, since it uses less digits than its factorization.

21323125044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16638 (or 16630 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21323125044 its reverse (44052132312), we get a palindrome (65375257356).

The spelling of 21323125044 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-five thousand, forty-four".