161121002101 has 4 divisors (see below), whose sum is σ = 161142750304. Its totient is φ = 161099253900.

The previous prime is 161121002087. The next prime is 161121002113. The reversal of 161121002101 is 101200121161.

161121002101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101200121161 = 99643 ⋅1015627.

It is a cyclic number.

It is not a de Polignac number, because 161121002101 - 2²⁵ = 161087447669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161121002131) 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 3 ways as a sum of consecutive naturals, for example, 10862985 + ... + 10877806.

It is an arithmetic number, because the mean of its divisors is an integer number (40285687576).

Almost surely, 2^161121002101 is an apocalyptic number.

It is an amenable number.

161121002101 is a deficient number, since it is larger than the sum of its proper divisors (21748203).

161121002101 is an equidigital number, since it uses as much as digits as its factorization.

161121002101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21748202.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 161121002101 its reverse (101200121161), we get a palindrome (262321123262).

The spelling of 161121002101 in words is "one hundred sixty-one billion, one hundred twenty-one million, two thousand, one hundred one".