1222221210221 has 4 divisors (see below), whose sum is σ = 1333332229344. Its totient is φ = 1111110191100.

The previous prime is 1222221210047. The next prime is 1222221210269. The reversal of 1222221210221 is 1220121222221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1222221210221 - 2³⁴ = 1205041341037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222221210193 and 1222221210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222221215221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55555509545 + ... + 55555509566.

It is an arithmetic number, because the mean of its divisors is an integer number (333333057336).

Almost surely, 2^{1222221210221} is an apocalyptic number.

1222221210221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222221210221 is a deficient number, since it is larger than the sum of its proper divisors (111111019123).

1222221210221 is a wasteful number, since it uses less digits than its factorization.

1222221210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111111019122.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1222221210221 its reverse (1220121222221), we get a palindrome (2442342432442).

The spelling of 1222221210221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".