21222131201 has 4 divisors (see below), whose sum is σ = 21581828400. Its totient is φ = 20862434004.

The previous prime is 21222131191. The next prime is 21222131207. The reversal of 21222131201 is 10213122212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21222131201 - 2¹⁰ = 21222130177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222131201.

It is not an unprimeable number, because it can be changed into a prime (21222131207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179848511 + ... + 179848628.

It is an arithmetic number, because the mean of its divisors is an integer number (5395457100).

Almost surely, 2^21222131201 is an apocalyptic number.

It is an amenable number.

21222131201 is a deficient number, since it is larger than the sum of its proper divisors (359697199).

21222131201 is an equidigital number, since it uses as much as digits as its factorization.

21222131201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359697198.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21222131201 its reverse (10213122212), we get a palindrome (31435253413).

It can be divided in two parts, 21 and 222131201, that added together give a palindrome (222131222).

The spelling of 21222131201 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, two hundred one".