121020131111 has 4 divisors (see below), whose sum is σ = 132021961224. Its totient is φ = 110018301000.

The previous prime is 121020131081. The next prime is 121020131123. The reversal of 121020131111 is 111131020121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121020131111 - 2¹⁰ = 121020130087 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 (121020131171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500915040 + ... + 5500915061.

It is an arithmetic number, because the mean of its divisors is an integer number (33005490306).

Almost surely, 2^121020131111 is an apocalyptic number.

121020131111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121020131111 is a deficient number, since it is larger than the sum of its proper divisors (11001830113).

121020131111 is a wasteful number, since it uses less digits than its factorization.

121020131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11001830112.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 121020131111 its reverse (111131020121), we get a palindrome (232151151232).

The spelling of 121020131111 in words is "one hundred twenty-one billion, twenty million, one hundred thirty-one thousand, one hundred eleven".