21928120 has 32 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 8736640.

The previous prime is 21928103. The next prime is 21928121. The reversal of 21928120 is 2182912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21928121) 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, 10785 + ... + 12655.

It is an arithmetic number, because the mean of its divisors is an integer number (1547910).

Almost surely, 2^21928120 is an apocalyptic number.

21928120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21928120 is an abundant number, since it is smaller than the sum of its proper divisors (27605000).

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

21928120 is a wasteful number, since it uses less digits than its factorization.

21928120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21928120 is about 4682.7470570169. The cubic root of 21928120 is about 279.8984325495.

The spelling of 21928120 in words is "twenty-one million, nine hundred twenty-eight thousand, one hundred twenty".