21212111143 has 2 divisors, whose sum is σ = 21212111144. Its totient is φ = 21212111142.

The previous prime is 21212111101. The next prime is 21212111191. The reversal of 21212111143 is 34111121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212111143 - 2⁹ = 21212110631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212111143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212211143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606055571 + 10606055572.

It is an arithmetic number, because the mean of its divisors is an integer number (10606055572).

Almost surely, 2^21212111143 is an apocalyptic number.

21212111143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212111143 is an equidigital number, since it uses as much as digits as its factorization.

21212111143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

Adding to 21212111143 its reverse (34111121212), we get a palindrome (55323232355).

It can be divided in two parts, 21212 and 111143, that added together give a triangular number (132355 = T₅₁₄).

The spelling of 21212111143 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred forty-three".