112121021609 has 2 divisors, whose sum is σ = 112121021610. Its totient is φ = 112121021608.

The previous prime is 112121021599. The next prime is 112121021629. The reversal of 112121021609 is 906120121211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99065674009 + 13055347600 = 314747^2 + 114260^2 .

It is an emirp because it is prime and its reverse (906120121211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 112121021609 - 2¹² = 112121017513 is a prime.

It is a super-3 number, since 3×112121021609³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (112121021629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56060510804 + 56060510805.

It is an arithmetic number, because the mean of its divisors is an integer number (56060510805).

Almost surely, 2^112121021609 is an apocalyptic number.

It is an amenable number.

112121021609 is a deficient number, since it is larger than the sum of its proper divisors (1).

112121021609 is an equidigital number, since it uses as much as digits as its factorization.

112121021609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 112121021609 in words is "one hundred twelve billion, one hundred twenty-one million, twenty-one thousand, six hundred nine".