821212212143 has 2 divisors, whose sum is σ = 821212212144. Its totient is φ = 821212212142.

The previous prime is 821212212137. The next prime is 821212212169. The reversal of 821212212143 is 341212212128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821212212143 - 2⁸ = 821212211887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821212214143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410606106071 + 410606106072.

It is an arithmetic number, because the mean of its divisors is an integer number (410606106072).

Almost surely, 2^821212212143 is an apocalyptic number.

821212212143 is a deficient number, since it is larger than the sum of its proper divisors (1).

821212212143 is an equidigital number, since it uses as much as digits as its factorization.

821212212143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 29.

The spelling of 821212212143 in words is "eight hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred forty-three".