212143400142221 has 2 divisors, whose sum is σ = 212143400142222. Its totient is φ = 212143400142220.

The previous prime is 212143400142203. The next prime is 212143400142257. The reversal of 212143400142221 is 122241004341212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143170557852100 + 68972842290121 = 11965390^2 + 8304989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212143400142221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212143400142721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106071700071110 + 106071700071111.

It is an arithmetic number, because the mean of its divisors is an integer number (106071700071111).

Almost surely, 2^{212143400142221} is an apocalyptic number.

It is an amenable number.

212143400142221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212143400142221 is an equidigital number, since it uses as much as digits as its factorization.

212143400142221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 212143400142221 its reverse (122241004341212), we get a palindrome (334384404483433).

The spelling of 212143400142221 in words is "two hundred twelve trillion, one hundred forty-three billion, four hundred million, one hundred forty-two thousand, two hundred twenty-one".