21032002 has 8 divisors (see below), whose sum is σ = 31567500. Its totient is φ = 10509504.

The previous prime is 21031979. The next prime is 21032003. The reversal of 21032002 is 20023012.

It can be written as a sum of positive squares in 2 ways, for example, as 14676561 + 6355441 = 3831^2 + 2521^2 .

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 21032002.

It is not an unprimeable number, because it can be changed into a prime (21032003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4374 + ... + 7822.

Almost surely, 2^21032002 is an apocalyptic number.

21032002 is a deficient number, since it is larger than the sum of its proper divisors (10535498).

21032002 is a wasteful number, since it uses less digits than its factorization.

21032002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6500.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21032002 is about 4586.0660701739. The cubic root of 21032002 is about 276.0324910990.

Adding to 21032002 its reverse (20023012), we get a palindrome (41055014).

The spelling of 21032002 in words is "twenty-one million, thirty-two thousand, two".