21841723000 has 32 divisors (see below), whose sum is σ = 51109634160. Its totient is φ = 8736688800.

The previous prime is 21841722997. The next prime is 21841723009. The reversal of 21841723000 is 32714812.

It is a self number, because there is not a number n which added to its sum of digits gives 21841723000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841723009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10919862 + ... + 10921861.

Almost surely, 2^21841723000 is an apocalyptic number.

21841723000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21841723000 is an abundant number, since it is smaller than the sum of its proper divisors (29267911160).

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

21841723000 is a wasteful number, since it uses less digits than its factorization.

21841723000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21841744 (or 21841730 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 21841723000 in words is "twenty-one billion, eight hundred forty-one million, seven hundred twenty-three thousand".