21134434201 has 2 divisors, whose sum is σ = 21134434202. Its totient is φ = 21134434200.

The previous prime is 21134434193. The next prime is 21134434241. The reversal of 21134434201 is 10243443112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20956905225 + 177528976 = 144765^2 + 13324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134434201 - 2³ = 21134434193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21134434241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567217100 + 10567217101.

It is an arithmetic number, because the mean of its divisors is an integer number (10567217101).

Almost surely, 2^21134434201 is an apocalyptic number.

It is an amenable number.

21134434201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21134434201 is an equidigital number, since it uses as much as digits as its factorization.

21134434201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21134434201 its reverse (10243443112), we get a palindrome (31377877313).

The spelling of 21134434201 in words is "twenty-one billion, one hundred thirty-four million, four hundred thirty-four thousand, two hundred one".