1220121020221 has 8 divisors (see below), whose sum is σ = 1248519668000. Its totient is φ = 1191723451632.

The previous prime is 1220121020177. The next prime is 1220121020231. The reversal of 1220121020221 is 1220201210221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220121020221 - 2⁷ = 1220121020093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220121020195 and 1220121020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121020231) 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 7 ways as a sum of consecutive naturals, for example, 2299030 + ... + 2779528.

It is an arithmetic number, because the mean of its divisors is an integer number (156064958500).

Almost surely, 2^{1220121020221} is an apocalyptic number.

It is an amenable number.

1220121020221 is a deficient number, since it is larger than the sum of its proper divisors (28398647779).

1220121020221 is an equidigital number, since it uses as much as digits as its factorization.

1220121020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539595.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220121020221 its reverse (1220201210221), we get a palindrome (2440322230442).

The spelling of 1220121020221 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, twenty thousand, two hundred twenty-one".