521400113455201 has 2 divisors, whose sum is σ = 521400113455202. Its totient is φ = 521400113455200.

The previous prime is 521400113455189. The next prime is 521400113455271. The reversal of 521400113455201 is 102554311004125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278511005445201 + 242889108010000 = 16688649^2 + 15584900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521400113455201 is a prime.

It is a super-2 number, since 2×521400113455201² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521400113455271) 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, 260700056727600 + 260700056727601.

It is an arithmetic number, because the mean of its divisors is an integer number (260700056727601).

Almost surely, 2^{521400113455201} is an apocalyptic number.

It is an amenable number.

521400113455201 is a deficient number, since it is larger than the sum of its proper divisors (1).

521400113455201 is an equidigital number, since it uses as much as digits as its factorization.

521400113455201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 521400113455201 its reverse (102554311004125), we get a palindrome (623954424459326).

The spelling of 521400113455201 in words is "five hundred twenty-one trillion, four hundred billion, one hundred thirteen million, four hundred fifty-five thousand, two hundred one".