1220000211221 has 4 divisors (see below), whose sum is σ = 1330909321344. Its totient is φ = 1109091101100.

The previous prime is 1220000211169. The next prime is 1220000211289. The reversal of 1220000211221 is 1221120000221.

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 1220000211221 - 2¹⁰ = 1220000210197 is a prime.

It is a super-2 number, since 2×1220000211221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220000211196 and 1220000211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220000214221) 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, 55454555045 + ... + 55454555066.

It is an arithmetic number, because the mean of its divisors is an integer number (332727330336).

Almost surely, 2^{1220000211221} is an apocalyptic number.

1220000211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220000211221 is a deficient number, since it is larger than the sum of its proper divisors (110909110123).

1220000211221 is a wasteful number, since it uses less digits than its factorization.

1220000211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110909110122.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1220000211221 its reverse (1221120000221), we get a palindrome (2441120211442).

The spelling of 1220000211221 in words is "one trillion, two hundred twenty billion, two hundred eleven thousand, two hundred twenty-one".