2121202002001 has 4 divisors (see below), whose sum is σ = 2245978590372. Its totient is φ = 1996425413632.

The previous prime is 2121202001917. The next prime is 2121202002047. The reversal of 2121202002001 is 1002002021212.

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 865011603600 + 1256190398401 = 930060^2 + 1120799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121202002001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121202003001) 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, 62388294160 + ... + 62388294193.

It is an arithmetic number, because the mean of its divisors is an integer number (561494647593).

Almost surely, 2^{2121202002001} is an apocalyptic number.

It is an amenable number.

2121202002001 is a deficient number, since it is larger than the sum of its proper divisors (124776588371).

2121202002001 is a wasteful number, since it uses less digits than its factorization.

2121202002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124776588370.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2121202002001 its reverse (1002002021212), we get a palindrome (3123204023213).

The spelling of 2121202002001 in words is "two trillion, one hundred twenty-one billion, two hundred two million, two thousand, one".