21002152006 has 16 divisors (see below), whose sum is σ = 35098375680. Its totient is φ = 9343316680.

The previous prime is 21002151991. The next prime is 21002152013. The reversal of 21002152006 is 60025120012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10154746 + ... + 10156813.

It is an arithmetic number, because the mean of its divisors is an integer number (2193648480).

Almost surely, 2^21002152006 is an apocalyptic number.

21002152006 is a deficient number, since it is larger than the sum of its proper divisors (14096223674).

21002152006 is a wasteful number, since it uses less digits than its factorization.

21002152006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20311619.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21002152006 its reverse (60025120012), we get a palindrome (81027272018).

The spelling of 21002152006 in words is "twenty-one billion, two million, one hundred fifty-two thousand, six".