121221011211 has 8 divisors (see below), whose sum is σ = 161629623360. Its totient is φ = 80813203272.

The previous prime is 121221011159. The next prime is 121221011243. The reversal of 121221011211 is 112110122121.

It is a happy number.

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

It is not a de Polignac number, because 121221011211 - 2²⁶ = 121153902347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221016211) 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, 489300 + ... + 694158.

It is an arithmetic number, because the mean of its divisors is an integer number (20203702920).

Almost surely, 2^121221011211 is an apocalyptic number.

121221011211 is a deficient number, since it is larger than the sum of its proper divisors (40408612149).

121221011211 is a wasteful number, since it uses less digits than its factorization.

121221011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402105.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121221011211 its reverse (112110122121), we get a palindrome (233331133332).

The spelling of 121221011211 in words is "one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred eleven".