121112101021 has 4 divisors (see below), whose sum is σ = 122771170972. Its totient is φ = 119453031072.

The previous prime is 121112101009. The next prime is 121112101043. The reversal of 121112101021 is 120101211121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120101211121 = 523 ⋅229639027.

It can be written as a sum of positive squares in 2 ways, for example, as 92574756121 + 28537344900 = 304261^2 + 168930^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112101021 - 2¹¹ = 121112098973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112100992 and 121112101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112101051) 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, 829534866 + ... + 829535011.

It is an arithmetic number, because the mean of its divisors is an integer number (30692792743).

Almost surely, 2^121112101021 is an apocalyptic number.

It is an amenable number.

121112101021 is a deficient number, since it is larger than the sum of its proper divisors (1659069951).

121112101021 is an equidigital number, since it uses as much as digits as its factorization.

121112101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659069950.

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

Adding to 121112101021 its reverse (120101211121), we get a palindrome (241213312142).

The spelling of 121112101021 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred one thousand, twenty-one".