355212221521 has 2 divisors, whose sum is σ = 355212221522. Its totient is φ = 355212221520.

The previous prime is 355212221459. The next prime is 355212221543. The reversal of 355212221521 is 125122212553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349090723921 + 6121497600 = 590839^2 + 78240^2 .

It is a cyclic number.

It is not a de Polignac number, because 355212221521 - 2¹⁹ = 355211697233 is a prime.

It is not a weakly prime, because it can be changed into another prime (355212221821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177606110760 + 177606110761.

It is an arithmetic number, because the mean of its divisors is an integer number (177606110761).

Almost surely, 2^355212221521 is an apocalyptic number.

It is an amenable number.

355212221521 is a deficient number, since it is larger than the sum of its proper divisors (1).

355212221521 is an equidigital number, since it uses as much as digits as its factorization.

355212221521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 31.

The spelling of 355212221521 in words is "three hundred fifty-five billion, two hundred twelve million, two hundred twenty-one thousand, five hundred twenty-one".