121220211211 has 8 divisors (see below), whose sum is σ = 133549540848. Its totient is φ = 109109100000.

The previous prime is 121220211199. The next prime is 121220211239. The reversal of 121220211211 is 112112022121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121220211211 - 2¹³ = 121220203019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220211251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54553440 + ... + 54555661.

It is an arithmetic number, because the mean of its divisors is an integer number (16693692606).

Almost surely, 2^121220211211 is an apocalyptic number.

121220211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121220211211 is a deficient number, since it is larger than the sum of its proper divisors (12329329637).

121220211211 is a wasteful number, since it uses less digits than its factorization.

121220211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109109213.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121220211211 its reverse (112112022121), we get a palindrome (233332233332).

The spelling of 121220211211 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred eleven".