121220520311 has 16 divisors (see below), whose sum is σ = 133168644000. Its totient is φ = 109427529600.

The previous prime is 121220520307. The next prime is 121220520349. The reversal of 121220520311 is 113025022121.

It is a cyclic number.

It is not a de Polignac number, because 121220520311 - 2² = 121220520307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220520301) 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, 6528701 + ... + 6547241.

It is an arithmetic number, because the mean of its divisors is an integer number (8323040250).

Almost surely, 2^121220520311 is an apocalyptic number.

121220520311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121220520311 is a deficient number, since it is larger than the sum of its proper divisors (11948123689).

121220520311 is a wasteful number, since it uses less digits than its factorization.

121220520311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22690.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 121220520311 its reverse (113025022121), we get a palindrome (234245542432).

The spelling of 121220520311 in words is "one hundred twenty-one billion, two hundred twenty million, five hundred twenty thousand, three hundred eleven".