121020120100111 has 24 divisors (see below), whose sum is σ = 135201911795280. Its totient is φ = 108122816559744.

The previous prime is 121020120100043. The next prime is 121020120100129. The reversal of 121020120100111 is 111001021020121.

It is a happy number.

It is not a de Polignac number, because 121020120100111 - 2³⁵ = 120985760361743 is a prime.

It is a super-3 number, since 3×121020120100111³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020120100091 and 121020120100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020120100511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133966750 + ... + 134867083.

It is an arithmetic number, because the mean of its divisors is an integer number (5633412991470).

Almost surely, 2^{121020120100111} is an apocalyptic number.

121020120100111 is a deficient number, since it is larger than the sum of its proper divisors (14181791695169).

121020120100111 is a wasteful number, since it uses less digits than its factorization.

121020120100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268833943 (or 268833924 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121020120100111 its reverse (111001021020121), we get a palindrome (232021141120232).

The spelling of 121020120100111 in words is "one hundred twenty-one trillion, twenty billion, one hundred twenty million, one hundred thousand, one hundred eleven".