21241442 has 4 divisors (see below), whose sum is σ = 31862166. Its totient is φ = 10620720.

The previous prime is 21241433. The next prime is 21241453. The reversal of 21241442 is 24414212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12952801 + 8288641 = 3599^2 + 2879^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310359 + ... + 5310362.

Almost surely, 2^21241442 is an apocalyptic number.

21241442 is a deficient number, since it is larger than the sum of its proper divisors (10620724).

21241442 is a wasteful number, since it uses less digits than its factorization.

21241442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620723.

The product of its digits is 512, while the sum is 20.

The square root of 21241442 is about 4608.8438897407. The cubic root of 21241442 is about 276.9457247899.

Adding to 21241442 its reverse (24414212), we get a palindrome (45655654).

The spelling of 21241442 in words is "twenty-one million, two hundred forty-one thousand, four hundred forty-two".