21230960 has 80 divisors (see below), whose sum is σ = 53273376. Its totient is φ = 7839744.

The previous prime is 21230959. The next prime is 21230969. The reversal of 21230960 is 6903212.

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 (21230969) 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 15 ways as a sum of consecutive naturals, for example, 91004 + ... + 91236.

Almost surely, 2^21230960 is an apocalyptic number.

21230960 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 21230960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26636688).

21230960 is an abundant number, since it is smaller than the sum of its proper divisors (32042416).

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

21230960 is a wasteful number, since it uses less digits than its factorization.

21230960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21230960 is about 4607.7065878808. The cubic root of 21230960 is about 276.9001625547.

The spelling of 21230960 in words is "twenty-one million, two hundred thirty thousand, nine hundred sixty".