21002012203 has 8 divisors (see below), whose sum is σ = 21163811328. Its totient is φ = 20840770944.

The previous prime is 21002012201. The next prime is 21002012209. The reversal of 21002012203 is 30221020012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002012203 - 2¹ = 21002012201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002012201) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 63726 + ... + 214627.

It is an arithmetic number, because the mean of its divisors is an integer number (2645476416).

Almost surely, 2^21002012203 is an apocalyptic number.

21002012203 is a deficient number, since it is larger than the sum of its proper divisors (161799125).

21002012203 is a wasteful number, since it uses less digits than its factorization.

21002012203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278933.

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

Adding to 21002012203 its reverse (30221020012), we get a palindrome (51223032215).

The spelling of 21002012203 in words is "twenty-one billion, two million, twelve thousand, two hundred three".