21203222201 has 16 divisors (see below), whose sum is σ = 25193804160. Its totient is φ = 17466261120.

The previous prime is 21203222191. The next prime is 21203222251. The reversal of 21203222201 is 10222230212.

It is not a de Polignac number, because 21203222201 - 2¹⁰ = 21203221177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21203222201.

It is not an unprimeable number, because it can be changed into a prime (21203222251) 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, 532106 + ... + 570563.

It is an arithmetic number, because the mean of its divisors is an integer number (1574612760).

Almost surely, 2^21203222201 is an apocalyptic number.

It is an amenable number.

21203222201 is a deficient number, since it is larger than the sum of its proper divisors (3990581959).

21203222201 is a wasteful number, since it uses less digits than its factorization.

21203222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102784.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21203222201 its reverse (10222230212), we get a palindrome (31425452413).

The spelling of 21203222201 in words is "twenty-one billion, two hundred three million, two hundred twenty-two thousand, two hundred one".