21712439448 has 320 divisors, whose sum is σ = 71161009920. Its totient is φ = 6057504000.

The previous prime is 21712439447. The next prime is 21712439467. The reversal of 21712439448 is 84493421712.

21712439448 is a `hidden beast` number, since 2 + 171 + 2 + 4 + 39 + 448 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712439447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 38025003 + ... + 38025573.

It is an arithmetic number, because the mean of its divisors is an integer number (222378156).

Almost surely, 2^21712439448 is an apocalyptic number.

21712439448 is a gapful number since it is divisible by the number (28) 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 21712439448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35580504960).

21712439448 is an abundant number, since it is smaller than the sum of its proper divisors (49448570472).

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

21712439448 is a wasteful number, since it uses less digits than its factorization.

21712439448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 767 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 21712439448 in words is "twenty-one billion, seven hundred twelve million, four hundred thirty-nine thousand, four hundred forty-eight".