21002102203 has 4 divisors (see below), whose sum is σ = 21198383640. Its totient is φ = 20805820768.

The previous prime is 21002102201. The next prime is 21002102207. The reversal of 21002102203 is 30220120012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002102203 - 2¹ = 21002102201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002102201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98140558 + ... + 98140771.

It is an arithmetic number, because the mean of its divisors is an integer number (5299595910).

Almost surely, 2^21002102203 is an apocalyptic number.

21002102203 is a deficient number, since it is larger than the sum of its proper divisors (196281437).

21002102203 is a wasteful number, since it uses less digits than its factorization.

21002102203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196281436.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21002102203 its reverse (30220120012), we get a palindrome (51222222215).

The spelling of 21002102203 in words is "twenty-one billion, two million, one hundred two thousand, two hundred three".