521403211487 has 2 divisors, whose sum is σ = 521403211488. Its totient is φ = 521403211486.

The previous prime is 521403211477. The next prime is 521403211519. The reversal of 521403211487 is 784112304125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521403211487 - 2¹⁸ = 521402949343 is a prime.

It is a super-2 number, since 2×521403211487² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521403211487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521403211447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260701605743 + 260701605744.

It is an arithmetic number, because the mean of its divisors is an integer number (260701605744).

Almost surely, 2^521403211487 is an apocalyptic number.

521403211487 is a deficient number, since it is larger than the sum of its proper divisors (1).

521403211487 is an equidigital number, since it uses as much as digits as its factorization.

521403211487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 521403211487 in words is "five hundred twenty-one billion, four hundred three million, two hundred eleven thousand, four hundred eighty-seven".