21126353302541 has 2 divisors, whose sum is σ = 21126353302542. Its totient is φ = 21126353302540.

The previous prime is 21126353302531. The next prime is 21126353302559. The reversal of 21126353302541 is 14520335362112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21088796800516 + 37556502025 = 4592254^2 + 193795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21126353302541 - 2³⁴ = 21109173433357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21126353302495 and 21126353302504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126353302531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563176651270 + 10563176651271.

It is an arithmetic number, because the mean of its divisors is an integer number (10563176651271).

Almost surely, 2^{21126353302541} is an apocalyptic number.

It is an amenable number.

21126353302541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126353302541 is an equidigital number, since it uses as much as digits as its factorization.

21126353302541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 21126353302541 its reverse (14520335362112), we get a palindrome (35646688664653).

The spelling of 21126353302541 in words is "twenty-one trillion, one hundred twenty-six billion, three hundred fifty-three million, three hundred two thousand, five hundred forty-one".