1221120122121 has 24 divisors (see below), whose sum is σ = 1765413000000. Its totient is φ = 813354448032.

The previous prime is 1221120122119. The next prime is 1221120122149. The reversal of 1221120122121 is 1212210211221.

1221120122121 is a `hidden beast` number, since 1 + 221 + 1 + 201 + 221 + 21 = 666.

It is not a de Polignac number, because 1221120122121 - 2¹ = 1221120122119 is a prime.

It is a super-2 number, since 2×1221120122121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221120122094 and 1221120122103.

It is not an unprimeable number, because it can be changed into a prime (1221120822121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71032195 + ... + 71049383.

It is an arithmetic number, because the mean of its divisors is an integer number (73558875000).

Almost surely, 2^{1221120122121} is an apocalyptic number.

It is an amenable number.

1221120122121 is a deficient number, since it is larger than the sum of its proper divisors (544292877879).

1221120122121 is a wasteful number, since it uses less digits than its factorization.

1221120122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23773 (or 23770 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221120122121 its reverse (1212210211221), we get a palindrome (2433330333342).

The spelling of 1221120122121 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".