21033242 has 8 divisors (see below), whose sum is σ = 32402676. Its totient is φ = 10232352.

The previous prime is 21033239. The next prime is 21033263. The reversal of 21033242 is 24233012.

It can be written as a sum of positive squares in 2 ways, for example, as 14371681 + 6661561 = 3791^2 + 2581^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21033242.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142043 + ... + 142190.

Almost surely, 2^21033242 is an apocalyptic number.

21033242 is a deficient number, since it is larger than the sum of its proper divisors (11369434).

21033242 is a wasteful number, since it uses less digits than its factorization.

21033242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284272.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21033242 is about 4586.2012603025. The cubic root of 21033242 is about 276.0379157460.

Adding to 21033242 its reverse (24233012), we get a palindrome (45266254).

The spelling of 21033242 in words is "twenty-one million, thirty-three thousand, two hundred forty-two".