2120012001221 has 4 divisors (see below), whose sum is σ = 2120015856972. Its totient is φ = 2120008145472.

The previous prime is 2120012001199. The next prime is 2120012001227. The reversal of 2120012001221 is 1221002100212.

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 1695240456196 + 424771545025 = 1302014^2 + 651745^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120012001221 - 2³⁸ = 1845134094277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120012001196 and 2120012001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120012001227) 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, 931466 + ... + 2260011.

It is an arithmetic number, because the mean of its divisors is an integer number (530003964243).

Almost surely, 2^{2120012001221} is an apocalyptic number.

It is an amenable number.

2120012001221 is a deficient number, since it is larger than the sum of its proper divisors (3855751).

2120012001221 is an equidigital number, since it uses as much as digits as its factorization.

2120012001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855750.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2120012001221 its reverse (1221002100212), we get a palindrome (3341014101433).

The spelling of 2120012001221 in words is "two trillion, one hundred twenty billion, twelve million, one thousand, two hundred twenty-one".