21210131111327 has 2 divisors, whose sum is σ = 21210131111328. Its totient is φ = 21210131111326.

The previous prime is 21210131111321. The next prime is 21210131111357. The reversal of 21210131111327 is 72311113101212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210131111327 - 2⁶ = 21210131111263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210131111296 and 21210131111305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210131111321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605065555663 + 10605065555664.

It is an arithmetic number, because the mean of its divisors is an integer number (10605065555664).

Almost surely, 2^{21210131111327} is an apocalyptic number.

21210131111327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210131111327 is an equidigital number, since it uses as much as digits as its factorization.

21210131111327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 26.

Adding to 21210131111327 its reverse (72311113101212), we get a palindrome (93521244212539).

The spelling of 21210131111327 in words is "twenty-one trillion, two hundred ten billion, one hundred thirty-one million, one hundred eleven thousand, three hundred twenty-seven".