21051232342541 has 2 divisors, whose sum is σ = 21051232342542. Its totient is φ = 21051232342540.

The previous prime is 21051232342531. The next prime is 21051232342559. The reversal of 21051232342541 is 14524323215012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10864736668900 + 10186495673641 = 3296170^2 + 3191629^2 .

It is a cyclic number.

It is not a de Polignac number, because 21051232342541 - 2⁶ = 21051232342477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21051232342531) 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, 10525616171270 + 10525616171271.

It is an arithmetic number, because the mean of its divisors is an integer number (10525616171271).

Almost surely, 2^{21051232342541} is an apocalyptic number.

It is an amenable number.

21051232342541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21051232342541 is an equidigital number, since it uses as much as digits as its factorization.

21051232342541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21051232342541 its reverse (14524323215012), we get a palindrome (35575555557553).

The spelling of 21051232342541 in words is "twenty-one trillion, fifty-one billion, two hundred thirty-two million, three hundred forty-two thousand, five hundred forty-one".