21210143241523 has 2 divisors, whose sum is σ = 21210143241524. Its totient is φ = 21210143241522.

The previous prime is 21210143241499. The next prime is 21210143241541. The reversal of 21210143241523 is 32514234101212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210143241523 is a prime.

It is a super-2 number, since 2×21210143241523² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21210143242523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605071620761 + 10605071620762.

It is an arithmetic number, because the mean of its divisors is an integer number (10605071620762).

Almost surely, 2^{21210143241523} is an apocalyptic number.

21210143241523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210143241523 is an equidigital number, since it uses as much as digits as its factorization.

21210143241523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21210143241523 its reverse (32514234101212), we get a palindrome (53724377342735).

The spelling of 21210143241523 in words is "twenty-one trillion, two hundred ten billion, one hundred forty-three million, two hundred forty-one thousand, five hundred twenty-three".