121112001021 has 32 divisors (see below), whose sum is σ = 177311232000. Its totient is φ = 72923215680.

The previous prime is 121112000939. The next prime is 121112001053. The reversal of 121112001021 is 120100211121.

It is not a de Polignac number, because 121112001021 - 2⁹ = 121112000509 is a prime.

It is a super-4 number, since 4×121112001021⁴ (a number of 45 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121112000988 and 121112001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112001061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13161180 + ... + 13170378.

It is an arithmetic number, because the mean of its divisors is an integer number (5540976000).

Almost surely, 2^121112001021 is an apocalyptic number.

121112001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121112001021 is a deficient number, since it is larger than the sum of its proper divisors (56199230979).

121112001021 is a wasteful number, since it uses less digits than its factorization.

121112001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11769.

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

Adding to 121112001021 its reverse (120100211121), we get a palindrome (241212212142).

The spelling of 121112001021 in words is "one hundred twenty-one billion, one hundred twelve million, one thousand, twenty-one".