21241000 has 64 divisors (see below), whose sum is σ = 54250560. Its totient is φ = 7720000.

The previous prime is 21240991. The next prime is 21241013. The reversal of 21241000 is 14212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10035 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (847665).

Almost surely, 2^21241000 is an apocalyptic number.

21241000 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 21241000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27125280).

21241000 is an abundant number, since it is smaller than the sum of its proper divisors (33009560).

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

21241000 is a wasteful number, since it uses less digits than its factorization.

21241000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21241000 is about 4608.7959382034. The cubic root of 21241000 is about 276.9438038459.

Adding to 21241000 its reverse (14212), we get a palindrome (21255212).

The spelling of 21241000 in words is "twenty-one million, two hundred forty-one thousand".