21495000 has 80 divisors (see below), whose sum is σ = 67197240. Its totient is φ = 5728000.

The previous prime is 21494999. The next prime is 21495011. The reversal of 21495000 is 59412.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14284 + ... + 15716.

Almost surely, 2^21495000 is an apocalyptic number.

21495000 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 21495000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33598620).

21495000 is an abundant number, since it is smaller than the sum of its proper divisors (45702240).

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

21495000 is a wasteful number, since it uses less digits than its factorization.

21495000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462 (or 1443 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 21495000 is about 4636.2700525315. The cubic root of 21495000 is about 278.0433312372.

The spelling of 21495000 in words is "twenty-one million, four hundred ninety-five thousand".