21241710 has 64 divisors (see below), whose sum is σ = 64742400. Its totient is φ = 4854816.

The previous prime is 21241667. The next prime is 21241723. The reversal of 21241710 is 1714212.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3730 + ... + 7509.

It is an arithmetic number, because the mean of its divisors is an integer number (1011600).

Almost surely, 2^21241710 is an apocalyptic number.

21241710 is an abundant number, since it is smaller than the sum of its proper divisors (43500690).

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

21241710 is a wasteful number, since it uses less digits than its factorization.

21241710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11262 (or 11256 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21241710 is about 4608.8729641855. The cubic root of 21241710 is about 276.9468895121.

Adding to 21241710 its reverse (1714212), we get a palindrome (22955922).

The spelling of 21241710 in words is "twenty-one million, two hundred forty-one thousand, seven hundred ten".