21111212010143 has 2 divisors, whose sum is σ = 21111212010144. Its totient is φ = 21111212010142.

The previous prime is 21111212010131. The next prime is 21111212010151. The reversal of 21111212010143 is 34101021211112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111212010143 - 2¹⁶ = 21111211944607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111212010193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555606005071 + 10555606005072.

It is an arithmetic number, because the mean of its divisors is an integer number (10555606005072).

Almost surely, 2^{21111212010143} is an apocalyptic number.

21111212010143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111212010143 is an equidigital number, since it uses as much as digits as its factorization.

21111212010143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21111212010143 its reverse (34101021211112), we get a palindrome (55212233221255).

The spelling of 21111212010143 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, one hundred forty-three".