21222200002 has 12 divisors (see below), whose sum is σ = 33815997810. Its totient is φ = 9986917376.

The previous prime is 21222199993. The next prime is 21222200009. The reversal of 21222200002 is 20000222212.

It can be written as a sum of positive squares in 3 ways, for example, as 21007313721 + 214886281 = 144939^2 + 14659^2 .

It is not an unprimeable number, because it can be changed into a prime (21222200009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18357727 + ... + 18358882.

Almost surely, 2^21222200002 is an apocalyptic number.

21222200002 is a deficient number, since it is larger than the sum of its proper divisors (12593797808).

21222200002 is a wasteful number, since it uses less digits than its factorization.

21222200002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36716645 (or 36716628 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21222200002 its reverse (20000222212), we get a palindrome (41222422214).

The spelling of 21222200002 in words is "twenty-one billion, two hundred twenty-two million, two hundred thousand, two".