21003111201 has 16 divisors (see below), whose sum is σ = 28625534784. Its totient is φ = 13693103424.

The previous prime is 21003111187. The next prime is 21003111223. The reversal of 21003111201 is 10211130012.

It is not a de Polignac number, because 21003111201 - 2⁵ = 21003111169 is a prime.

It is a super-2 number, since 2×21003111201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003111251) 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, 166326 + ... + 263951.

It is an arithmetic number, because the mean of its divisors is an integer number (1789095924).

Almost surely, 2^21003111201 is an apocalyptic number.

It is an amenable number.

21003111201 is a deficient number, since it is larger than the sum of its proper divisors (7622423583).

21003111201 is a wasteful number, since it uses less digits than its factorization.

21003111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430640.

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

Adding to 21003111201 its reverse (10211130012), we get a palindrome (31214241213).

The spelling of 21003111201 in words is "twenty-one billion, three million, one hundred eleven thousand, two hundred one".