121021021211 has 4 divisors (see below), whose sum is σ = 121402791312. Its totient is φ = 120639251112.

The previous prime is 121021021201. The next prime is 121021021237. The reversal of 121021021211 is 112120120121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112120120121 = 59 ⋅1900341019.

It is a cyclic number.

It is not a de Polignac number, because 121021021211 - 2¹⁴ = 121021004827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190884575 + ... + 190885208.

It is an arithmetic number, because the mean of its divisors is an integer number (30350697828).

Almost surely, 2^121021021211 is an apocalyptic number.

121021021211 is a deficient number, since it is larger than the sum of its proper divisors (381770101).

121021021211 is an equidigital number, since it uses as much as digits as its factorization.

121021021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381770100.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121021021211 its reverse (112120120121), we get a palindrome (233141141332).

The spelling of 121021021211 in words is "one hundred twenty-one billion, twenty-one million, twenty-one thousand, two hundred eleven".