121121213231211 has 4 divisors (see below), whose sum is σ = 161494950974952. Its totient is φ = 80747475487472.

The previous prime is 121121213231159. The next prime is 121121213231267. The reversal of 121121213231211 is 112132312121121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121121213231211 - 2²¹ = 121121211134059 is a prime.

It is a super-2 number, since 2×121121213231211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121121213230211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20186868871866 + ... + 20186868871871.

It is an arithmetic number, because the mean of its divisors is an integer number (40373737743738).

Almost surely, 2^{121121213231211} is an apocalyptic number.

121121213231211 is a deficient number, since it is larger than the sum of its proper divisors (40373737743741).

121121213231211 is an equidigital number, since it uses as much as digits as its factorization.

121121213231211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40373737743740.

The product of its digits is 288, while the sum is 24.

Adding to 121121213231211 its reverse (112132312121121), we get a palindrome (233253525352332).

The spelling of 121121213231211 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred eleven".