21241722 has 16 divisors (see below), whose sum is σ = 42701472. Its totient is φ = 7044240.

The previous prime is 21241667. The next prime is 21241723. The reversal of 21241722 is 22714212.

It is not an unprimeable number, because it can be changed into a prime (21241723) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7804 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (2668842).

Almost surely, 2^21241722 is an apocalyptic number.

21241722 is an abundant number, since it is smaller than the sum of its proper divisors (21459750).

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

21241722 is a wasteful number, since it uses less digits than its factorization.

21241722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18173.

The product of its digits is 448, while the sum is 21.

The square root of 21241722 is about 4608.8742660220. The cubic root of 21241722 is about 276.9469416636.

Adding to 21241722 its reverse (22714212), we get a palindrome (43955934).

The spelling of 21241722 in words is "twenty-one million, two hundred forty-one thousand, seven hundred twenty-two".