21795960 has 64 divisors (see below), whose sum is σ = 67168800. Its totient is φ = 5654016.

The previous prime is 21795959. The next prime is 21796009. The reversal of 21795960 is 6959712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1986 + ... + 6894.

Almost surely, 2^21795960 is an apocalyptic number.

21795960 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 21795960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33584400).

21795960 is an abundant number, since it is smaller than the sum of its proper divisors (45372840).

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

21795960 is a wasteful number, since it uses less digits than its factorization.

21795960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960 (or 4956 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 21795960 is about 4668.6143554592. The cubic root of 21795960 is about 279.3349864368.

The spelling of 21795960 in words is "twenty-one million, seven hundred ninety-five thousand, nine hundred sixty".