161002010121 has 4 divisors (see below), whose sum is σ = 214669346832. Its totient is φ = 107334673412.

The previous prime is 161002010093. The next prime is 161002010167. The reversal of 161002010121 is 121010200161.

It is a happy number.

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: 121010200161 = 3 ⋅40336733387.

It is a cyclic number.

It is not a de Polignac number, because 161002010121 - 2¹¹ = 161002008073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161002010121.

It is not an unprimeable number, because it can be changed into a prime (161002000121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26833668351 + ... + 26833668356.

It is an arithmetic number, because the mean of its divisors is an integer number (53667336708).

Almost surely, 2^161002010121 is an apocalyptic number.

It is an amenable number.

161002010121 is a deficient number, since it is larger than the sum of its proper divisors (53667336711).

161002010121 is an equidigital number, since it uses as much as digits as its factorization.

161002010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53667336710.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 161002010121 its reverse (121010200161), we get a palindrome (282012210282).

The spelling of 161002010121 in words is "one hundred sixty-one billion, two million, ten thousand, one hundred twenty-one".