21002002102 has 8 divisors (see below), whose sum is σ = 31514912496. Its totient is φ = 10497031272.

The previous prime is 21002002081. The next prime is 21002002111. The reversal of 21002002102 is 20120020012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978273 + ... + 1988860.

It is an arithmetic number, because the mean of its divisors is an integer number (3939364062).

Almost surely, 2^21002002102 is an apocalyptic number.

21002002102 is a deficient number, since it is larger than the sum of its proper divisors (10512910394).

21002002102 is a wasteful number, since it uses less digits than its factorization.

21002002102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969782.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21002002102 its reverse (20120020012), we get a palindrome (41122022114).

The spelling of 21002002102 in words is "twenty-one billion, two million, two thousand, one hundred two".