1220120101221 has 24 divisors (see below), whose sum is σ = 1904963868864. Its totient is φ = 692594179200.

The previous prime is 1220120101159. The next prime is 1220120101229. The reversal of 1220120101221 is 1221010210221.

It is not a de Polignac number, because 1220120101221 - 2³¹ = 1217972617573 is a prime.

It is a super-2 number, since 2×1220120101221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220120101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120101229) 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 23 ways as a sum of consecutive naturals, for example, 27461700 + ... + 27506093.

It is an arithmetic number, because the mean of its divisors is an integer number (79373494536).

Almost surely, 2^{1220120101221} is an apocalyptic number.

It is an amenable number.

1220120101221 is a deficient number, since it is larger than the sum of its proper divisors (684843767643).

1220120101221 is a wasteful number, since it uses less digits than its factorization.

1220120101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54967961 (or 54967954 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220120101221 its reverse (1221010210221), we get a palindrome (2441130311442).

The spelling of 1220120101221 in words is "one trillion, two hundred twenty billion, one hundred twenty million, one hundred one thousand, two hundred twenty-one".