21507526503941 has 2 divisors, whose sum is σ = 21507526503942. Its totient is φ = 21507526503940.

The previous prime is 21507526503937. The next prime is 21507526504003. The reversal of 21507526503941 is 14930562570512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18460857492100 + 3046669011841 = 4296610^2 + 1745471^2 .

It is a cyclic number.

It is not a de Polignac number, because 21507526503941 - 2² = 21507526503937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21507526503941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21507526503901) 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, 10753763251970 + 10753763251971.

It is an arithmetic number, because the mean of its divisors is an integer number (10753763251971).

Almost surely, 2^{21507526503941} is an apocalyptic number.

It is an amenable number.

21507526503941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507526503941 is an equidigital number, since it uses as much as digits as its factorization.

21507526503941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 21507526503941 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, five hundred three thousand, nine hundred forty-one".