21164705143 has 2 divisors, whose sum is σ = 21164705144. Its totient is φ = 21164705142.

The previous prime is 21164705129. The next prime is 21164705147. The reversal of 21164705143 is 34150746112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21164705143 - 2¹³ = 21164696951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21164705099 and 21164705108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21164705147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10582352571 + 10582352572.

It is an arithmetic number, because the mean of its divisors is an integer number (10582352572).

Almost surely, 2^21164705143 is an apocalyptic number.

21164705143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21164705143 is an equidigital number, since it uses as much as digits as its factorization.

21164705143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21164705143 in words is "twenty-one billion, one hundred sixty-four million, seven hundred five thousand, one hundred forty-three".