121221110211 has 8 divisors (see below), whose sum is σ = 161630137344. Its totient is φ = 80813078280.

The previous prime is 121221110147. The next prime is 121221110221. The reversal of 121221110211 is 112011122121.

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 121221110211 - 2⁶ = 121221110147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221110221) 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, 108870 + ... + 504276.

It is an arithmetic number, because the mean of its divisors is an integer number (20203767168).

Almost surely, 2^121221110211 is an apocalyptic number.

121221110211 is a deficient number, since it is larger than the sum of its proper divisors (40409027133).

121221110211 is a wasteful number, since it uses less digits than its factorization.

121221110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497601.

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

Adding to 121221110211 its reverse (112011122121), we get a palindrome (233232232332).

The spelling of 121221110211 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, two hundred eleven".