21033212222 has 16 divisors (see below), whose sum is σ = 34434597744. Its totient is φ = 9555936000.

The previous prime is 21033212219. The next prime is 21033212251. The reversal of 21033212222 is 22221233012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21033212194 and 21033212203.

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, 183929 + ... + 275492.

It is an arithmetic number, because the mean of its divisors is an integer number (2152162359).

Almost surely, 2^21033212222 is an apocalyptic number.

21033212222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21033212222 is a deficient number, since it is larger than the sum of its proper divisors (13401385522).

21033212222 is a wasteful number, since it uses less digits than its factorization.

21033212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461515.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21033212222 its reverse (22221233012), we get a palindrome (43254445234).

The spelling of 21033212222 in words is "twenty-one billion, thirty-three million, two hundred twelve thousand, two hundred twenty-two".