21507526741201 has 2 divisors, whose sum is σ = 21507526741202. Its totient is φ = 21507526741200.

The previous prime is 21507526741193. The next prime is 21507526741247. The reversal of 21507526741201 is 10214762570512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18615350331601 + 2892176409600 = 4314551^2 + 1700640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21507526741201 - 2³ = 21507526741193 is a prime.

It is a super-2 number, since 2×21507526741201² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21507526741601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753763370600 + 10753763370601.

It is an arithmetic number, because the mean of its divisors is an integer number (10753763370601).

Almost surely, 2^{21507526741201} is an apocalyptic number.

It is an amenable number.

21507526741201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507526741201 is an equidigital number, since it uses as much as digits as its factorization.

21507526741201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 21507526741201 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, seven hundred forty-one thousand, two hundred one".