2121336601 has 4 divisors (see below), whose sum is σ = 2121991972. Its totient is φ = 2120681232.

The previous prime is 2121336599. The next prime is 2121336611. The reversal of 2121336601 is 1066331212.

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 1440126601 + 681210000 = 37949^2 + 26100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121336601 - 2¹ = 2121336599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121336611) 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, 322806 + ... + 329311.

It is an arithmetic number, because the mean of its divisors is an integer number (530497993).

Almost surely, 2^2121336601 is an apocalyptic number.

It is an amenable number.

2121336601 is a deficient number, since it is larger than the sum of its proper divisors (655371).

2121336601 is an equidigital number, since it uses as much as digits as its factorization.

2121336601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655370.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2121336601 is about 46057.9700052011. The cubic root of 2121336601 is about 1284.9015758313.

Adding to 2121336601 its reverse (1066331212), we get a palindrome (3187667813).

The spelling of 2121336601 in words is "two billion, one hundred twenty-one million, three hundred thirty-six thousand, six hundred one".