1222220000021 has 4 divisors (see below), whose sum is σ = 1235952809100. Its totient is φ = 1208487190944.

The previous prime is 1222220000017. The next prime is 1222220000041. The reversal of 1222220000021 is 1200000222221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 258119883025 + 964100116996 = 508055^2 + 981886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222220000021 - 2² = 1222220000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222219999960 and 1222220000005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222220000011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6866404406 + ... + 6866404583.

It is an arithmetic number, because the mean of its divisors is an integer number (308988202275).

Almost surely, 2^{1222220000021} is an apocalyptic number.

It is an amenable number.

1222220000021 is a deficient number, since it is larger than the sum of its proper divisors (13732809079).

1222220000021 is an equidigital number, since it uses as much as digits as its factorization.

1222220000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13732809078.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1222220000021 its reverse (1200000222221), we get a palindrome (2422220222242).

The spelling of 1222220000021 in words is "one trillion, two hundred twenty-two billion, two hundred twenty million, twenty-one", and thus it is an aban number.