2012120203421 has 2 divisors, whose sum is σ = 2012120203422. Its totient is φ = 2012120203420.

The previous prime is 2012120203393. The next prime is 2012120203451. The reversal of 2012120203421 is 1243020212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1842021698521 + 170098504900 = 1357211^2 + 412430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012120203421 - 2¹⁸ = 2012119941277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012120203393 and 2012120203402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2012120203451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006060101710 + 1006060101711.

It is an arithmetic number, because the mean of its divisors is an integer number (1006060101711).

Almost surely, 2^{2012120203421} is an apocalyptic number.

It is an amenable number.

2012120203421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012120203421 is an equidigital number, since it uses as much as digits as its factorization.

2012120203421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 2012120203421 its reverse (1243020212102), we get a palindrome (3255140415523).

The spelling of 2012120203421 in words is "two trillion, twelve billion, one hundred twenty million, two hundred three thousand, four hundred twenty-one".