1211121130221 has 6 divisors (see below), whose sum is σ = 1749397188110. Its totient is φ = 807414086808.

The previous prime is 1211121130213. The next prime is 1211121130223. The reversal of 1211121130221 is 1220311211121.

It is a happy number.

1211121130221 is a `hidden beast` number, since 121 + 11 + 211 + 302 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1209923001225 + 1198128996 = 1099965^2 + 34614^2 .

It is not a de Polignac number, because 1211121130221 - 2³ = 1211121130213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211121130194 and 1211121130203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121130223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67284507226 + ... + 67284507243.

Almost surely, 2^{1211121130221} is an apocalyptic number.

It is an amenable number.

1211121130221 is a deficient number, since it is larger than the sum of its proper divisors (538276057889).

1211121130221 is a wasteful number, since it uses less digits than its factorization.

1211121130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134569014475 (or 134569014472 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211121130221 its reverse (1220311211121), we get a palindrome (2431432341342).

The spelling of 1211121130221 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred thirty thousand, two hundred twenty-one".