21230123143 has 2 divisors, whose sum is σ = 21230123144. Its totient is φ = 21230123142.

The previous prime is 21230123137. The next prime is 21230123147. The reversal of 21230123143 is 34132103212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21230123143 - 2¹³ = 21230114951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230123147) 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, 10615061571 + 10615061572.

It is an arithmetic number, because the mean of its divisors is an integer number (10615061572).

Almost surely, 2^21230123143 is an apocalyptic number.

21230123143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230123143 is an equidigital number, since it uses as much as digits as its factorization.

21230123143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21230123143 its reverse (34132103212), we get a palindrome (55362226355).

The spelling of 21230123143 in words is "twenty-one billion, two hundred thirty million, one hundred twenty-three thousand, one hundred forty-three".