204320134409621 has 2 divisors, whose sum is σ = 204320134409622. Its totient is φ = 204320134409620.

The previous prime is 204320134409617. The next prime is 204320134409627. The reversal of 204320134409621 is 126904431023402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138976984322500 + 65343150087121 = 11788850^2 + 8083511^2 .

It is a cyclic number.

It is not a de Polignac number, because 204320134409621 - 2² = 204320134409617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204320134409627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102160067204810 + 102160067204811.

It is an arithmetic number, because the mean of its divisors is an integer number (102160067204811).

Almost surely, 2^{204320134409621} is an apocalyptic number.

It is an amenable number.

204320134409621 is a deficient number, since it is larger than the sum of its proper divisors (1).

204320134409621 is an equidigital number, since it uses as much as digits as its factorization.

204320134409621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 204320134409621 in words is "two hundred four trillion, three hundred twenty billion, one hundred thirty-four million, four hundred nine thousand, six hundred twenty-one".