21001112012203 has 4 divisors (see below), whose sum is σ = 21002232150000. Its totient is φ = 20999991874408.

The previous prime is 21001112012047. The next prime is 21001112012269. The reversal of 21001112012203 is 30221021110012.

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 21001112012203 - 2⁴¹ = 18802088756651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001112052203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560040775 + ... + 560078272.

It is an arithmetic number, because the mean of its divisors is an integer number (5250558037500).

Almost surely, 2^{21001112012203} is an apocalyptic number.

21001112012203 is a deficient number, since it is larger than the sum of its proper divisors (1120137797).

21001112012203 is a wasteful number, since it uses less digits than its factorization.

21001112012203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120137796.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21001112012203 its reverse (30221021110012), we get a palindrome (51222133122215).

The spelling of 21001112012203 in words is "twenty-one trillion, one billion, one hundred twelve million, twelve thousand, two hundred three".