212134140221 has 2 divisors, whose sum is σ = 212134140222. Its totient is φ = 212134140220.

The previous prime is 212134140173. The next prime is 212134140227. The reversal of 212134140221 is 122041431212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140812562500 + 71321577721 = 375250^2 + 267061^2 .

It is a cyclic number.

It is not a de Polignac number, because 212134140221 - 2⁶ = 212134140157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212134140227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106067070110 + 106067070111.

It is an arithmetic number, because the mean of its divisors is an integer number (106067070111).

Almost surely, 2^212134140221 is an apocalyptic number.

It is an amenable number.

212134140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212134140221 is an equidigital number, since it uses as much as digits as its factorization.

212134140221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 212134140221 its reverse (122041431212), we get a palindrome (334175571433).

The spelling of 212134140221 in words is "two hundred twelve billion, one hundred thirty-four million, one hundred forty thousand, two hundred twenty-one".