2113421 has 2 divisors, whose sum is σ = 2113422. Its totient is φ = 2113420.

The previous prime is 2113417. The next prime is 2113451. The reversal of 2113421 is 1243112.

2113421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 122500 = 1411^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113421 - 2² = 2113417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2113396 and 2113405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056710 + 1056711.

It is an arithmetic number, because the mean of its divisors is an integer number (1056711).

2^2113421 is an apocalyptic number.

It is an amenable number.

2113421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113421 is an equidigital number, since it uses as much as digits as its factorization.

2113421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 14.

The square root of 2113421 is about 1453.7609844813. The cubic root of 2113421 is about 128.3301414097.

Adding to 2113421 its reverse (1243112), we get a palindrome (3356533).

The spelling of 2113421 in words is "two million, one hundred thirteen thousand, four hundred twenty-one".