21131121301211 has 2 divisors, whose sum is σ = 21131121301212. Its totient is φ = 21131121301210.

The previous prime is 21131121301193. The next prime is 21131121301231. The reversal of 21131121301211 is 11210312113112.

It is an a-pointer prime, because the next prime (21131121301231) can be obtained adding 21131121301211 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131121301211 - 2³⁴ = 21113941432027 is a prime.

It is not a weakly prime, because it can be changed into another prime (21131121301231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565560650605 + 10565560650606.

It is an arithmetic number, because the mean of its divisors is an integer number (10565560650606).

Almost surely, 2^{21131121301211} is an apocalyptic number.

21131121301211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131121301211 is an equidigital number, since it uses as much as digits as its factorization.

21131121301211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 21131121301211 its reverse (11210312113112), we get a palindrome (32341433414323).

The spelling of 21131121301211 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred twenty-one million, three hundred one thousand, two hundred eleven".