121131221211 has 72 divisors (see below), whose sum is σ = 239116301424. Its totient is φ = 58084871040.

The previous prime is 121131221191. The next prime is 121131221243. The reversal of 121131221211 is 112122131121.

It is a happy number.

121131221211 is a `hidden beast` number, since 121 + 1 + 312 + 21 + 211 = 666.

It is not a de Polignac number, because 121131221211 - 2⁶ = 121131221147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121131321211) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 897336 + ... + 1023461.

It is an arithmetic number, because the mean of its divisors is an integer number (3321059742).

Almost surely, 2^121131221211 is an apocalyptic number.

121131221211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121131221211 is a deficient number, since it is larger than the sum of its proper divisors (117985080213).

121131221211 is a wasteful number, since it uses less digits than its factorization.

121131221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920841 (or 1920831 counting only the distinct ones).

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

Adding to 121131221211 its reverse (112122131121), we get a palindrome (233253352332).

The spelling of 121131221211 in words is "one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred eleven".