2121123202001 has 4 divisors (see below), whose sum is σ = 2122728898404. Its totient is φ = 2119517505600.

The previous prime is 2121123201947. The next prime is 2121123202019. The reversal of 2121123202001 is 1002023211212.

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 1381978931776 + 739144270225 = 1175576^2 + 859735^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121123202001 - 2⁶ = 2121123201937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121123202201) 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, 802846220 + ... + 802848861.

It is an arithmetic number, because the mean of its divisors is an integer number (530682224601).

Almost surely, 2^{2121123202001} is an apocalyptic number.

It is an amenable number.

2121123202001 is a deficient number, since it is larger than the sum of its proper divisors (1605696403).

2121123202001 is a wasteful number, since it uses less digits than its factorization.

2121123202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605696402.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2121123202001 its reverse (1002023211212), we get a palindrome (3123146413213).

The spelling of 2121123202001 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred two thousand, one".