21210023143 has 2 divisors, whose sum is σ = 21210023144. Its totient is φ = 21210023142.

The previous prime is 21210023141. The next prime is 21210023251. The reversal of 21210023143 is 34132001212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210023143 - 2¹ = 21210023141 is a prime.

Together with 21210023141, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21210023143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210023141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605011571 + 10605011572.

It is an arithmetic number, because the mean of its divisors is an integer number (10605011572).

Almost surely, 2^21210023143 is an apocalyptic number.

21210023143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210023143 is an equidigital number, since it uses as much as digits as its factorization.

21210023143 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.

Adding to 21210023143 its reverse (34132001212), we get a palindrome (55342024355).

The spelling of 21210023143 in words is "twenty-one billion, two hundred ten million, twenty-three thousand, one hundred forty-three".