21002354006 has 8 divisors (see below), whose sum is σ = 31557201480. Its totient is φ = 10483286848.

The previous prime is 21002353951. The next prime is 21002354063. The reversal of 21002354006 is 60045320012.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8943611 + ... + 8945958.

It is an arithmetic number, because the mean of its divisors is an integer number (3944650185).

Almost surely, 2^21002354006 is an apocalyptic number.

21002354006 is a deficient number, since it is larger than the sum of its proper divisors (10554847474).

21002354006 is a wasteful number, since it uses less digits than its factorization.

21002354006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17890158.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21002354006 its reverse (60045320012), we get a palindrome (81047674018).

The spelling of 21002354006 in words is "twenty-one billion, two million, three hundred fifty-four thousand, six".