21027002 has 4 divisors (see below), whose sum is σ = 31540506. Its totient is φ = 10513500.

The previous prime is 21026987. The next prime is 21027007. The reversal of 21027002 is 20072012.

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., 18241441 + 2785561 = 4271^2 + 1669^2 .

It is not an unprimeable number, because it can be changed into a prime (21027007) 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 as a sum of consecutive naturals, namely, 5256749 + ... + 5256752.

Almost surely, 2^21027002 is an apocalyptic number.

21027002 is a deficient number, since it is larger than the sum of its proper divisors (10513504).

21027002 is a wasteful number, since it uses less digits than its factorization.

21027002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10513503.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 21027002 is about 4585.5209082502. The cubic root of 21027002 is about 276.0106153587.

Adding to 21027002 its reverse (20072012), we get a palindrome (41099014).

The spelling of 21027002 in words is "twenty-one million, twenty-seven thousand, two".