240161002121 has 4 divisors (see below), whose sum is σ = 241157521044. Its totient is φ = 239164483200.

The previous prime is 240161002063. The next prime is 240161002153. The reversal of 240161002121 is 121200161042.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189931227721 + 50229774400 = 435811^2 + 224120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240161002121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 240161002093 and 240161002102.

It is not an unprimeable number, because it can be changed into a prime (240161002171) 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, 498259100 + ... + 498259581.

It is an arithmetic number, because the mean of its divisors is an integer number (60289380261).

Almost surely, 2^240161002121 is an apocalyptic number.

It is an amenable number.

240161002121 is a deficient number, since it is larger than the sum of its proper divisors (996518923).

240161002121 is an equidigital number, since it uses as much as digits as its factorization.

240161002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996518922.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 240161002121 its reverse (121200161042), we get a palindrome (361361163163).

The spelling of 240161002121 in words is "two hundred forty billion, one hundred sixty-one million, two thousand, one hundred twenty-one".