121221122211 has 64 divisors (see below), whose sum is σ = 216371036160. Its totient is φ = 65608302240.

The previous prime is 121221122207. The next prime is 121221122221. The reversal of 121221122211 is 112221122121.

It is not a de Polignac number, because 121221122211 - 2² = 121221122207 is a prime.

It is a super-3 number, since 3×121221122211³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (121221122201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55270 + ... + 495476.

It is an arithmetic number, because the mean of its divisors is an integer number (3380797440).

Almost surely, 2^121221122211 is an apocalyptic number.

121221122211 is a deficient number, since it is larger than the sum of its proper divisors (95149913949).

121221122211 is a wasteful number, since it uses less digits than its factorization.

121221122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440301 (or 440295 counting only the distinct ones).

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

Adding to 121221122211 its reverse (112221122121), we get a palindrome (233442244332).

The spelling of 121221122211 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred eleven".