121220101211 has 16 divisors (see below), whose sum is σ = 133176814848. Its totient is φ = 109421743200.

The previous prime is 121220101207. The next prime is 121220101229. The reversal of 121220101211 is 112101022121.

It is not a de Polignac number, because 121220101211 - 2² = 121220101207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121220101231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1034396 + ... + 1145606.

It is an arithmetic number, because the mean of its divisors is an integer number (8323550928).

Almost surely, 2^121220101211 is an apocalyptic number.

121220101211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121220101211 is a deficient number, since it is larger than the sum of its proper divisors (11956713637).

121220101211 is a wasteful number, since it uses less digits than its factorization.

121220101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111922.

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

Adding to 121220101211 its reverse (112101022121), we get a palindrome (233321123332).

The spelling of 121220101211 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred one thousand, two hundred eleven".