2121201221001 has 8 divisors (see below), whose sum is σ = 2828279771520. Its totient is φ = 1414128408912.

The previous prime is 2121201220939. The next prime is 2121201221003. The reversal of 2121201221001 is 1001221021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121201221001 - 2¹⁸ = 2121200958857 is a prime.

It is a super-2 number, since 2×2121201221001² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121201221003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481665 + ... + 2115278.

It is an arithmetic number, because the mean of its divisors is an integer number (353534971440).

Almost surely, 2^{2121201221001} is an apocalyptic number.

It is an amenable number.

2121201221001 is a deficient number, since it is larger than the sum of its proper divisors (707078550519).

2121201221001 is a wasteful number, since it uses less digits than its factorization.

2121201221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869215.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121201221001 its reverse (1001221021212), we get a palindrome (3122422242213).

The spelling of 2121201221001 in words is "two trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, one".