21831244000 has 48 divisors (see below), whose sum is σ = 53639376336. Its totient is φ = 8732496000.

The previous prime is 21831243997. The next prime is 21831244009. The reversal of 21831244000 is 44213812.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21831244009) 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, 2724906 + ... + 2732905.

It is an arithmetic number, because the mean of its divisors is an integer number (1117487007).

Almost surely, 2^21831244000 is an apocalyptic number.

21831244000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21831244000 is an abundant number, since it is smaller than the sum of its proper divisors (31808132336).

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

21831244000 is an equidigital number, since it uses as much as digits as its factorization.

21831244000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5457836 (or 5457818 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21831244000 its reverse (44213812), we get a palindrome (21875457812).

The spelling of 21831244000 in words is "twenty-one billion, eight hundred thirty-one million, two hundred forty-four thousand".