2140423421 has 2 divisors, whose sum is σ = 2140423422. Its totient is φ = 2140423420.

The previous prime is 2140423357. The next prime is 2140423429. The reversal of 2140423421 is 1243240412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1405200196 + 735223225 = 37486^2 + 27115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140423421 - 2⁶ = 2140423357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140423429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070211710 + 1070211711.

It is an arithmetic number, because the mean of its divisors is an integer number (1070211711).

Almost surely, 2^2140423421 is an apocalyptic number.

It is an amenable number.

2140423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140423421 is an equidigital number, since it uses as much as digits as its factorization.

2140423421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 2140423421 is about 46264.7103200701. The cubic root of 2140423421 is about 1288.7437283973.

Adding to 2140423421 its reverse (1243240412), we get a palindrome (3383663833).

The spelling of 2140423421 in words is "two billion, one hundred forty million, four hundred twenty-three thousand, four hundred twenty-one".