213255659521 has 2 divisors, whose sum is σ = 213255659522. Its totient is φ = 213255659520.

The previous prime is 213255659489. The next prime is 213255659543. The reversal of 213255659521 is 125956552312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128978666496 + 84276993025 = 359136^2 + 290305^2 .

It is a cyclic number.

It is not a de Polignac number, because 213255659521 - 2⁵ = 213255659489 is a prime.

It is not a weakly prime, because it can be changed into another prime (213255659921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106627829760 + 106627829761.

It is an arithmetic number, because the mean of its divisors is an integer number (106627829761).

Almost surely, 2^213255659521 is an apocalyptic number.

It is an amenable number.

213255659521 is a deficient number, since it is larger than the sum of its proper divisors (1).

213255659521 is an equidigital number, since it uses as much as digits as its factorization.

213255659521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810000, while the sum is 46.

The spelling of 213255659521 in words is "two hundred thirteen billion, two hundred fifty-five million, six hundred fifty-nine thousand, five hundred twenty-one".