121112332100021 has 16 divisors (see below), whose sum is σ = 128346861772080. Its totient is φ = 113890091581440.

The previous prime is 121112332099981. The next prime is 121112332100047. The reversal of 121112332100021 is 120001233211121.

It can be written as a sum of positive squares in 8 ways, for example, as 41789618031121 + 79322714068900 = 6464489^2 + 8906330^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112332100021 - 2³⁸ = 120837454193077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112332099966 and 121112332100002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112332108021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106435001 + ... + 107566881.

It is an arithmetic number, because the mean of its divisors is an integer number (8021678860755).

Almost surely, 2^{121112332100021} is an apocalyptic number.

It is an amenable number.

121112332100021 is a deficient number, since it is larger than the sum of its proper divisors (7234529672059).

121112332100021 is a wasteful number, since it uses less digits than its factorization.

121112332100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137304.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 121112332100021 its reverse (120001233211121), we get a palindrome (241113565311142).

The spelling of 121112332100021 in words is "one hundred twenty-one trillion, one hundred twelve billion, three hundred thirty-two million, one hundred thousand, twenty-one".