121112010021 has 16 divisors (see below), whose sum is σ = 162251421824. Its totient is φ = 80357638464.

The previous prime is 121112010013. The next prime is 121112010073. The reversal of 121112010021 is 120010211121.

It is not a de Polignac number, because 121112010021 - 2³ = 121112010013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121112009979 and 121112010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112050021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645696 + ... + 811878.

It is an arithmetic number, because the mean of its divisors is an integer number (10140713864).

Almost surely, 2^121112010021 is an apocalyptic number.

It is an amenable number.

121112010021 is a deficient number, since it is larger than the sum of its proper divisors (41139411803).

121112010021 is a wasteful number, since it uses less digits than its factorization.

121112010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167340.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121112010021 its reverse (120010211121), we get a palindrome (241122221142).

The spelling of 121112010021 in words is "one hundred twenty-one billion, one hundred twelve million, ten thousand, twenty-one".