21043002 has 16 divisors (see below), whose sum is σ = 42340032. Its totient is φ = 6972000.

The previous prime is 21042997. The next prime is 21043007. The reversal of 21043002 is 20034012.

It is an interprime number because it is at equal distance from previous prime (21042997) and next prime (21043007).

It is not an unprimeable number, because it can be changed into a prime (21043007) by changing a digit.

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, 9499 + ... + 11502.

It is an arithmetic number, because the mean of its divisors is an integer number (2646252).

Almost surely, 2^21043002 is an apocalyptic number.

21043002 is an abundant number, since it is smaller than the sum of its proper divisors (21297030).

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

21043002 is a wasteful number, since it uses less digits than its factorization.

21043002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21173.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21043002 is about 4587.2651983508. The cubic root of 21043002 is about 276.0806055265.

Adding to 21043002 its reverse (20034012), we get a palindrome (41077014).

The spelling of 21043002 in words is "twenty-one million, forty-three thousand, two".