21002003102 has 4 divisors (see below), whose sum is σ = 31503004656. Its totient is φ = 10501001550.

The previous prime is 21002003089. The next prime is 21002003119. The reversal of 21002003102 is 20130020012.

It is a happy number.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 5250500774 + ... + 5250500777.

It is an arithmetic number, because the mean of its divisors is an integer number (7875751164).

Almost surely, 2^21002003102 is an apocalyptic number.

21002003102 is a deficient number, since it is larger than the sum of its proper divisors (10501001554).

21002003102 is a wasteful number, since it uses less digits than its factorization.

21002003102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501001553.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21002003102 its reverse (20130020012), we get a palindrome (41132023114).

The spelling of 21002003102 in words is "twenty-one billion, two million, three thousand, one hundred two".