21236002 has 8 divisors (see below), whose sum is σ = 32715036. Its totient is φ = 10330992.

The previous prime is 21235999. The next prime is 21236021. The reversal of 21236002 is 20063212.

It can be written as a sum of positive squares in 2 ways, for example, as 19793601 + 1442401 = 4449^2 + 1201^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143413 + ... + 143560.

Almost surely, 2^21236002 is an apocalyptic number.

21236002 is a deficient number, since it is larger than the sum of its proper divisors (11479034).

21236002 is a wasteful number, since it uses less digits than its factorization.

21236002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287012.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21236002 is about 4608.2536822532. The cubic root of 21236002 is about 276.9220805480.

Adding to 21236002 its reverse (20063212), we get a palindrome (41299214).

The spelling of 21236002 in words is "twenty-one million, two hundred thirty-six thousand, two".