1220122212221 has 16 divisors (see below), whose sum is σ = 1334006256768. Its totient is φ = 1106734881600.

The previous prime is 1220122212163. The next prime is 1220122212223. The reversal of 1220122212221 is 1222122210221.

It is a cyclic number.

It is not a de Polignac number, because 1220122212221 - 2³⁰ = 1219048470397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220122212193 and 1220122212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220122212223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8958251 + ... + 9093431.

It is an arithmetic number, because the mean of its divisors is an integer number (83375391048).

Almost surely, 2^{1220122212221} is an apocalyptic number.

1220122212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220122212221 is a deficient number, since it is larger than the sum of its proper divisors (113884044547).

1220122212221 is a wasteful number, since it uses less digits than its factorization.

1220122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137012.

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

Adding to 1220122212221 its reverse (1222122210221), we get a palindrome (2442244422442).

The spelling of 1220122212221 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".