21027000 has 128 divisors (see below), whose sum is σ = 67541760. Its totient is φ = 5443200.

The previous prime is 21026987. The next prime is 21027007. The reversal of 21027000 is 72012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128919 + ... + 129081.

It is an arithmetic number, because the mean of its divisors is an integer number (527670).

Almost surely, 2^21027000 is an apocalyptic number.

21027000 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 21027000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33770880).

21027000 is an abundant number, since it is smaller than the sum of its proper divisors (46514760).

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

21027000 is a wasteful number, since it uses less digits than its factorization.

21027000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 21027000 is about 4585.5206901725. The cubic root of 21027000 is about 276.0106066077.

Adding to 21027000 its reverse (72012), we get a palindrome (21099012).

The spelling of 21027000 in words is "twenty-one million, twenty-seven thousand".