2101212221201 has 4 divisors (see below), whose sum is σ = 2101242988032. Its totient is φ = 2101181454372.

The previous prime is 2101212221191. The next prime is 2101212221221. The reversal of 2101212221201 is 1021222121012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101212221201 - 2³⁸ = 1826334314257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101212221201.

It is not an unprimeable number, because it can be changed into a prime (2101212221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15280745 + ... + 15417638.

It is an arithmetic number, because the mean of its divisors is an integer number (525310747008).

Almost surely, 2^{2101212221201} is an apocalyptic number.

It is an amenable number.

2101212221201 is a deficient number, since it is larger than the sum of its proper divisors (30766831).

2101212221201 is an equidigital number, since it uses as much as digits as its factorization.

2101212221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30766830.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2101212221201 its reverse (1021222121012), we get a palindrome (3122434342213).

The spelling of 2101212221201 in words is "two trillion, one hundred one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred one".