2143011421 has 2 divisors, whose sum is σ = 2143011422. Its totient is φ = 2143011420.

The previous prime is 2143011419. The next prime is 2143011457. The reversal of 2143011421 is 1241103412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1726402500 + 416608921 = 41550^2 + 20411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143011421 - 2¹ = 2143011419 is a prime.

Together with 2143011419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143011461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071505710 + 1071505711.

It is an arithmetic number, because the mean of its divisors is an integer number (1071505711).

Almost surely, 2^2143011421 is an apocalyptic number.

It is an amenable number.

2143011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143011421 is an equidigital number, since it uses as much as digits as its factorization.

2143011421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2143011421 is about 46292.6713530338. The cubic root of 2143011421 is about 1289.2629286961.

Adding to 2143011421 its reverse (1241103412), we get a palindrome (3384114833).

The spelling of 2143011421 in words is "two billion, one hundred forty-three million, eleven thousand, four hundred twenty-one".