21002112002 has 8 divisors (see below), whose sum is σ = 31882724496. Its totient is φ = 10374537172.

The previous prime is 21002111993. The next prime is 21002112017. The reversal of 21002112002 is 20021120012.

It is a happy number.

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

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, 63259208 + ... + 63259539.

It is an arithmetic number, because the mean of its divisors is an integer number (3985340562).

Almost surely, 2^21002112002 is an apocalyptic number.

21002112002 is a deficient number, since it is larger than the sum of its proper divisors (10880612494).

21002112002 is a wasteful number, since it uses less digits than its factorization.

21002112002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126518832.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002112002 its reverse (20021120012), we get a palindrome (41023232014).

The spelling of 21002112002 in words is "twenty-one billion, two million, one hundred twelve thousand, two".