2121120012001 has 4 divisors (see below), whose sum is σ = 2122153194772. Its totient is φ = 2120086829232.

The previous prime is 2121120011903. The next prime is 2121120012013. The reversal of 2121120012001 is 1002100211212.

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 1515548117776 + 605571894225 = 1231076^2 + 778185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121120012001 - 2⁷ = 2121120011873 is a prime.

It is a super-2 number, since 2×2121120012001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121120012031) 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, 516588306 + ... + 516592411.

It is an arithmetic number, because the mean of its divisors is an integer number (530538298693).

Almost surely, 2^{2121120012001} is an apocalyptic number.

It is an amenable number.

2121120012001 is a deficient number, since it is larger than the sum of its proper divisors (1033182771).

2121120012001 is a wasteful number, since it uses less digits than its factorization.

2121120012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033182770.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121120012001 its reverse (1002100211212), we get a palindrome (3123220223213).

The spelling of 2121120012001 in words is "two trillion, one hundred twenty-one billion, one hundred twenty million, twelve thousand, one".