21222222201 has 24 divisors (see below), whose sum is σ = 31647742464. Its totient is φ = 13693652640.

The previous prime is 21222222181. The next prime is 21222222209. The reversal of 21222222201 is 10222222212.

21222222201 is a `hidden beast` number, since 21 + 222 + 222 + 201 = 666.

It is not a de Polignac number, because 21222222201 - 2⁹ = 21222221689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222222209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103231 + ... + 230436.

It is an arithmetic number, because the mean of its divisors is an integer number (1318655936).

Almost surely, 2^21222222201 is an apocalyptic number.

It is an amenable number.

21222222201 is a deficient number, since it is larger than the sum of its proper divisors (10425520263).

21222222201 is a wasteful number, since it uses less digits than its factorization.

21222222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333901 (or 333898 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222222201 its reverse (10222222212), we get a palindrome (31444444413).

It can be divided in two parts, 21 and 222222201, that added together give a palindrome (222222222).

The spelling of 21222222201 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred one".