21795000 has 80 divisors (see below), whose sum is σ = 68134440. Its totient is φ = 5808000.

The previous prime is 21794989. The next prime is 21795001. The reversal of 21795000 is 59712.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21795001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14274 + ... + 15726.

Almost surely, 2^21795000 is an apocalyptic number.

21795000 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 21795000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34067220).

21795000 is an abundant number, since it is smaller than the sum of its proper divisors (46339440).

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

21795000 is a wasteful number, since it uses less digits than its factorization.

21795000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 21795000 is about 4668.5115400950. The cubic root of 21795000 is about 279.3308852865.

The spelling of 21795000 in words is "twenty-one million, seven hundred ninety-five thousand".