21723300140 has 48 divisors (see below), whose sum is σ = 47139570912. Its totient is φ = 8402558976.

The previous prime is 21723300139. The next prime is 21723300143. The reversal of 21723300140 is 4100332712.

It is not an unprimeable number, because it can be changed into a prime (21723300143) 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, 30572 + ... + 210668.

It is an arithmetic number, because the mean of its divisors is an integer number (982074394).

Almost surely, 2^21723300140 is an apocalyptic number.

21723300140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21723300140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23569785456).

21723300140 is an abundant number, since it is smaller than the sum of its proper divisors (25416270772).

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

21723300140 is a wasteful number, since it uses less digits than its factorization.

21723300140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180306 (or 180304 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 21723300140 its reverse (4100332712), we get a palindrome (25823632852).

The spelling of 21723300140 in words is "twenty-one billion, seven hundred twenty-three million, three hundred thousand, one hundred forty".