2120011001221 has 4 divisors (see below), whose sum is σ = 2121568688844. Its totient is φ = 2118453313600.

The previous prime is 2120011001191. The next prime is 2120011001293. The reversal of 2120011001221 is 1221001100212.

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 199330996225 + 1920680004996 = 446465^2 + 1385886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120011001221 - 2¹⁷ = 2120010870149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120011091221) 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, 778841770 + ... + 778844491.

It is an arithmetic number, because the mean of its divisors is an integer number (530392172211).

Almost surely, 2^{2120011001221} is an apocalyptic number.

It is an amenable number.

2120011001221 is a deficient number, since it is larger than the sum of its proper divisors (1557687623).

2120011001221 is a wasteful number, since it uses less digits than its factorization.

2120011001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557687622.

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

Adding to 2120011001221 its reverse (1221001100212), we get a palindrome (3341012101433).

The spelling of 2120011001221 in words is "two trillion, one hundred twenty billion, eleven million, one thousand, two hundred twenty-one".