1220010222221 has 4 divisors (see below), whose sum is σ = 1394297396832. Its totient is φ = 1045723047612.

The previous prime is 1220010222209. The next prime is 1220010222253. The reversal of 1220010222221 is 1222220100221.

It is a happy number.

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 1220010222221 - 2³⁰ = 1218936480397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220010222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220010224221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87143587295 + ... + 87143587308.

It is an arithmetic number, because the mean of its divisors is an integer number (348574349208).

Almost surely, 2^{1220010222221} is an apocalyptic number.

It is an amenable number.

1220010222221 is a deficient number, since it is larger than the sum of its proper divisors (174287174611).

1220010222221 is an equidigital number, since it uses as much as digits as its factorization.

1220010222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174287174610.

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

Adding to 1220010222221 its reverse (1222220100221), we get a palindrome (2442230322442).

The spelling of 1220010222221 in words is "one trillion, two hundred twenty billion, ten million, two hundred twenty-two thousand, two hundred twenty-one".