21024014320 has 80 divisors (see below), whose sum is σ = 49497233760. Its totient is φ = 8303820800.

The previous prime is 21024014299. The next prime is 21024014327. The reversal of 21024014320 is 2341042012.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024014327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6912000 + ... + 6915040.

It is an arithmetic number, because the mean of its divisors is an integer number (618715422).

Almost surely, 2^21024014320 is an apocalyptic number.

21024014320 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 21024014320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24748616880).

21024014320 is an abundant number, since it is smaller than the sum of its proper divisors (28473219440).

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

21024014320 is a wasteful number, since it uses less digits than its factorization.

21024014320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114 (or 4108 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21024014320 its reverse (2341042012), we get a palindrome (23365056332).

The spelling of 21024014320 in words is "twenty-one billion, twenty-four million, fourteen thousand, three hundred twenty".