2143213021 has 2 divisors, whose sum is σ = 2143213022. Its totient is φ = 2143213020.

The previous prime is 2143212989. The next prime is 2143213043. The reversal of 2143213021 is 1203123412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2140080121 + 3132900 = 46261^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143213021 - 2⁵ = 2143212989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2143213021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071606510 + 1071606511.

It is an arithmetic number, because the mean of its divisors is an integer number (1071606511).

Almost surely, 2^2143213021 is an apocalyptic number.

It is an amenable number.

2143213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143213021 is an equidigital number, since it uses as much as digits as its factorization.

2143213021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2143213021 is about 46294.8487523180. The cubic root of 2143213021 is about 1289.3033558032.

Adding to 2143213021 its reverse (1203123412), we get a palindrome (3346336433).

It can be divided in two parts, 21432 and 13021, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 2143213021 in words is "two billion, one hundred forty-three million, two hundred thirteen thousand, twenty-one".