2121001021001 has 16 divisors (see below), whose sum is σ = 2159990323200. Its totient is φ = 2082151176000.

The previous prime is 2121001020991. The next prime is 2121001021033. The reversal of 2121001021001 is 1001201001212.

It is a cyclic number.

It is not a de Polignac number, because 2121001021001 - 2⁶ = 2121001020937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121001021901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83363240 + ... + 83388678.

It is an arithmetic number, because the mean of its divisors is an integer number (134999395200).

Almost surely, 2^{2121001021001} is an apocalyptic number.

It is an amenable number.

2121001021001 is a deficient number, since it is larger than the sum of its proper divisors (38989302199).

2121001021001 is a wasteful number, since it uses less digits than its factorization.

2121001021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28120.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2121001021001 its reverse (1001201001212), we get a palindrome (3122202022213).

The spelling of 2121001021001 in words is "two trillion, one hundred twenty-one billion, one million, twenty-one thousand, one".