21120221222 has 8 divisors (see below), whose sum is σ = 31794702096. Its totient is φ = 10521987192.

The previous prime is 21120221219. The next prime is 21120221257. The reversal of 21120221222 is 22212202112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21120221222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19061018 + ... + 19062125.

It is an arithmetic number, because the mean of its divisors is an integer number (3974337762).

Almost surely, 2^21120221222 is an apocalyptic number.

21120221222 is a deficient number, since it is larger than the sum of its proper divisors (10674480874).

21120221222 is a wasteful number, since it uses less digits than its factorization.

21120221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38123422.

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

Adding to 21120221222 its reverse (22212202112), we get a palindrome (43332423334).

The spelling of 21120221222 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-two".