121020111111 has 8 divisors (see below), whose sum is σ = 161401232880. Its totient is φ = 80659531712.

The previous prime is 121020111053. The next prime is 121020111137. The reversal of 121020111111 is 111111020121.

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

It is a cyclic number.

It is not a de Polignac number, because 121020111111 - 2⁹ = 121020110599 is a prime.

It is a super-3 number, since 3×121020111111³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020112111) 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, 5121840 + ... + 5145413.

It is an arithmetic number, because the mean of its divisors is an integer number (20175154110).

Almost surely, 2^121020111111 is an apocalyptic number.

121020111111 is a deficient number, since it is larger than the sum of its proper divisors (40381121769).

121020111111 is a wasteful number, since it uses less digits than its factorization.

121020111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271185.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121020111111 its reverse (111111020121), we get a palindrome (232131131232).

The spelling of 121020111111 in words is "one hundred twenty-one billion, twenty million, one hundred eleven thousand, one hundred eleven".