21484242 has 24 divisors (see below), whose sum is σ = 50130444. Its totient is φ = 6610464.

The previous prime is 21484241. The next prime is 21484249. The reversal of 21484242 is 24248412.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 772641 = 4551^2 + 879^2 .

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21484241) 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 11 ways as a sum of consecutive naturals, for example, 45673 + ... + 46140.

Almost surely, 2^21484242 is an apocalyptic number.

21484242 is an abundant number, since it is smaller than the sum of its proper divisors (28646202).

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

21484242 is a wasteful number, since it uses less digits than its factorization.

21484242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91834 (or 91831 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

The square root of 21484242 is about 4635.1097074395. The cubic root of 21484242 is about 277.9969376679.

The spelling of 21484242 in words is "twenty-one million, four hundred eighty-four thousand, two hundred forty-two".