21112012221143 has 2 divisors, whose sum is σ = 21112012221144. Its totient is φ = 21112012221142.

The previous prime is 21112012221073. The next prime is 21112012221149. The reversal of 21112012221143 is 34112221021112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112012221143 - 2¹⁶ = 21112012155607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112012221149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556006110571 + 10556006110572.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006110572).

Almost surely, 2^{21112012221143} is an apocalyptic number.

21112012221143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012221143 is an equidigital number, since it uses as much as digits as its factorization.

21112012221143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21112012221143 its reverse (34112221021112), we get a palindrome (55224233242255).

The spelling of 21112012221143 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-one thousand, one hundred forty-three".