21276000 has 192 divisors, whose sum is σ = 77837760. Its totient is φ = 5644800.

The previous prime is 21275983. The next prime is 21276023. The reversal of 21276000 is 67212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107902 + ... + 108098.

It is an arithmetic number, because the mean of its divisors is an integer number (405405).

Almost surely, 2^21276000 is an apocalyptic number.

21276000 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 21276000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38918880).

21276000 is an abundant number, since it is smaller than the sum of its proper divisors (56561760).

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

21276000 is a wasteful number, since it uses less digits than its factorization.

21276000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21276000 is about 4612.5914625078. The cubic root of 21276000 is about 277.0958323769.

The spelling of 21276000 in words is "twenty-one million, two hundred seventy-six thousand".