1121020120221 has 64 divisors (see below), whose sum is σ = 1739800166400. Its totient is φ = 636858326016.

The previous prime is 1121020120151. The next prime is 1121020120237. The reversal of 1121020120221 is 1220210201211.

It is not a de Polignac number, because 1121020120221 - 2²² = 1121015925917 is a prime.

It is a super-2 number, since 2×1121020120221² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121020120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121020120421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27370260 + ... + 27411186.

It is an arithmetic number, because the mean of its divisors is an integer number (27184377600).

Almost surely, 2^{1121020120221} is an apocalyptic number.

It is an amenable number.

1121020120221 is a deficient number, since it is larger than the sum of its proper divisors (618780046179).

1121020120221 is a wasteful number, since it uses less digits than its factorization.

1121020120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42218.

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

Adding to 1121020120221 its reverse (1220210201211), we get a palindrome (2341230321432).

The spelling of 1121020120221 in words is "one trillion, one hundred twenty-one billion, twenty million, one hundred twenty thousand, two hundred twenty-one".