2140421 has 2 divisors, whose sum is σ = 2140422. Its totient is φ = 2140420.

The previous prime is 2140399. The next prime is 2140441. The reversal of 2140421 is 1240412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 1060900 = 1039^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140421 - 2¹⁴ = 2124037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2140396 and 2140405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070210 + 1070211.

It is an arithmetic number, because the mean of its divisors is an integer number (1070211).

2^2140421 is an apocalyptic number.

It is an amenable number.

2140421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140421 is an equidigital number, since it uses as much as digits as its factorization.

2140421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2140421 is about 1463.0177715940. The cubic root of 2140421 is about 128.8743242504.

Adding to 2140421 its reverse (1240412), we get a palindrome (3380833).

Subtracting from 2140421 its reverse (1240412), we obtain a palindrome (900009).

The spelling of 2140421 in words is "two million, one hundred forty thousand, four hundred twenty-one".