21131112210343 has 2 divisors, whose sum is σ = 21131112210344. Its totient is φ = 21131112210342.

The previous prime is 21131112210277. The next prime is 21131112210347. The reversal of 21131112210343 is 34301221113112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21131112210343 - 2²⁹ = 21130575339431 is a prime.

It is a super-2 number, since 2×21131112210343² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131112210347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565556105171 + 10565556105172.

It is an arithmetic number, because the mean of its divisors is an integer number (10565556105172).

Almost surely, 2^{21131112210343} is an apocalyptic number.

21131112210343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131112210343 is an equidigital number, since it uses as much as digits as its factorization.

21131112210343 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 25.

Adding to 21131112210343 its reverse (34301221113112), we get a palindrome (55432333323455).

The spelling of 21131112210343 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred twelve million, two hundred ten thousand, three hundred forty-three".