2002404432121 has 4 divisors (see below), whose sum is σ = 2002407916644. Its totient is φ = 2002400947600.

The previous prime is 2002404432109. The next prime is 2002404432139. The reversal of 2002404432121 is 1212344042002.

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 1406451311721 + 595953120400 = 1185939^2 + 771980^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002404432121 - 2²¹ = 2002402334969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002404432181) 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, 653470 + ... + 2105191.

It is an arithmetic number, because the mean of its divisors is an integer number (500601979161).

Almost surely, 2^{2002404432121} is an apocalyptic number.

It is an amenable number.

2002404432121 is a deficient number, since it is larger than the sum of its proper divisors (3484523).

2002404432121 is an equidigital number, since it uses as much as digits as its factorization.

2002404432121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484522.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 2002404432121 its reverse (1212344042002), we get a palindrome (3214748474123).

The spelling of 2002404432121 in words is "two trillion, two billion, four hundred four million, four hundred thirty-two thousand, one hundred twenty-one".