121021012211 has 4 divisors (see below), whose sum is σ = 132022922424. Its totient is φ = 110019102000.

The previous prime is 121021012199. The next prime is 121021012219. The reversal of 121021012211 is 112210120121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021012211 is a prime.

It is a super-2 number, since 2×121021012211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021012219) 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, 5500955090 + ... + 5500955111.

It is an arithmetic number, because the mean of its divisors is an integer number (33005730606).

Almost surely, 2^121021012211 is an apocalyptic number.

121021012211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121021012211 is a deficient number, since it is larger than the sum of its proper divisors (11001910213).

121021012211 is a wasteful number, since it uses less digits than its factorization.

121021012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11001910212.

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

Adding to 121021012211 its reverse (112210120121), we get a palindrome (233231132332).

The spelling of 121021012211 in words is "one hundred twenty-one billion, twenty-one million, twelve thousand, two hundred eleven".