1220120221221 has 16 divisors (see below), whose sum is σ = 1971911469120. Its totient is φ = 739466800560.

The previous prime is 1220120221219. The next prime is 1220120221237. The reversal of 1220120221221 is 1221220210221.

It is a happy number.

1220120221221 is a `hidden beast` number, since 1 + 2 + 201 + 20 + 221 + 221 = 666.

It is not a de Polignac number, because 1220120221221 - 2¹ = 1220120221219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220120221194 and 1220120221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120271221) 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 15 ways as a sum of consecutive naturals, for example, 2054074150 + ... + 2054074743.

It is an arithmetic number, because the mean of its divisors is an integer number (123244466820).

Almost surely, 2^{1220120221221} is an apocalyptic number.

1220120221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220120221221 is a deficient number, since it is larger than the sum of its proper divisors (751791247899).

1220120221221 is a wasteful number, since it uses less digits than its factorization.

1220120221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108148913 (or 4108148907 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1220120221221 its reverse (1221220210221), we get a palindrome (2441340431442).

The spelling of 1220120221221 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".