161121010001 has 8 divisors (see below), whose sum is σ = 184149138624. Its totient is φ = 138095591760.

The previous prime is 161121009977. The next prime is 161121010027. The reversal of 161121010001 is 100010121161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161121010001 - 2²⁶ = 161053901137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161121010091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548570 + ... + 789411.

It is an arithmetic number, because the mean of its divisors is an integer number (23018642328).

Almost surely, 2^161121010001 is an apocalyptic number.

It is an amenable number.

161121010001 is a deficient number, since it is larger than the sum of its proper divisors (23028128623).

161121010001 is a wasteful number, since it uses less digits than its factorization.

161121010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355191.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 161121010001 its reverse (100010121161), we get a palindrome (261131131162).

The spelling of 161121010001 in words is "one hundred sixty-one billion, one hundred twenty-one million, ten thousand, one".