21222011222 has 16 divisors (see below), whose sum is σ = 32114296320. Its totient is φ = 10517577408.

The previous prime is 21222011201. The next prime is 21222011249. The reversal of 21222011222 is 22211022212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222011222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45803 + ... + 211049.

It is an arithmetic number, because the mean of its divisors is an integer number (2007143520).

Almost surely, 2^21222011222 is an apocalyptic number.

21222011222 is a deficient number, since it is larger than the sum of its proper divisors (10892285098).

21222011222 is a wasteful number, since it uses less digits than its factorization.

21222011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165815.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222011222 its reverse (22211022212), we get a palindrome (43433033434).

The spelling of 21222011222 in words is "twenty-one billion, two hundred twenty-two million, eleven thousand, two hundred twenty-two".