21035000 has 80 divisors (see below), whose sum is σ = 56419440. Its totient is φ = 7200000.

The previous prime is 21034999. The next prime is 21035029. The reversal of 21035000 is 53012.

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, 34700 + ... + 35300.

It is an arithmetic number, because the mean of its divisors is an integer number (705243).

Almost surely, 2^21035000 is an apocalyptic number.

21035000 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 21035000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28209720).

21035000 is an abundant number, since it is smaller than the sum of its proper divisors (35384440).

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

21035000 is an equidigital number, since it uses as much as digits as its factorization.

21035000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 21035000 is about 4586.3929181875. The cubic root of 21035000 is about 276.0456061302.

Adding to 21035000 its reverse (53012), we get a palindrome (21088012).

The spelling of 21035000 in words is "twenty-one million, thirty-five thousand".