21001010110203 has 16 divisors (see below), whose sum is σ = 28155179056160. Its totient is φ = 13923966583296.

The previous prime is 21001010110183. The next prime is 21001010110259. The reversal of 21001010110203 is 30201101010012.

It is not a de Polignac number, because 21001010110203 - 2¹⁰ = 21001010109179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001010110903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25760488 + ... + 26563221.

It is an arithmetic number, because the mean of its divisors is an integer number (1759698691010).

Almost surely, 2^{21001010110203} is an apocalyptic number.

21001010110203 is a deficient number, since it is larger than the sum of its proper divisors (7154168945957).

21001010110203 is a wasteful number, since it uses less digits than its factorization.

21001010110203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52324446.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21001010110203 its reverse (30201101010012), we get a palindrome (51202111120215).

The spelling of 21001010110203 in words is "twenty-one trillion, one billion, ten million, one hundred ten thousand, two hundred three".