234343220021 has 2 divisors, whose sum is σ = 234343220022. Its totient is φ = 234343220020.

The previous prime is 234343220003. The next prime is 234343220057. The reversal of 234343220021 is 120022343432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119567266225 + 114775953796 = 345785^2 + 338786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234343220021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (234343220071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117171610010 + 117171610011.

It is an arithmetic number, because the mean of its divisors is an integer number (117171610011).

Almost surely, 2^234343220021 is an apocalyptic number.

It is an amenable number.

234343220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

234343220021 is an equidigital number, since it uses as much as digits as its factorization.

234343220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 234343220021 its reverse (120022343432), we get a palindrome (354365563453).

The spelling of 234343220021 in words is "two hundred thirty-four billion, three hundred forty-three million, two hundred twenty thousand, twenty-one".