21241254 has 16 divisors (see below), whose sum is σ = 42921648. Its totient is φ = 7007232.

The previous prime is 21241249. The next prime is 21241261. The reversal of 21241254 is 45214212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21241254.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17667 + ... + 18830.

It is an arithmetic number, because the mean of its divisors is an integer number (2682603).

Almost surely, 2^21241254 is an apocalyptic number.

21241254 is an abundant number, since it is smaller than the sum of its proper divisors (21680394).

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

21241254 is a wasteful number, since it uses less digits than its factorization.

21241254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36599.

The product of its digits is 640, while the sum is 21.

The square root of 21241254 is about 4608.8234941252. The cubic root of 21241254 is about 276.9449077400.

Adding to 21241254 its reverse (45214212), we get a palindrome (66455466).

The spelling of 21241254 in words is "twenty-one million, two hundred forty-one thousand, two hundred fifty-four".